Lesson video

Hello, everybody.

Welcome back to another math lesson with me, Mrs. Pochciol.

As always, I'm hoping that we're gonna have lots of fun and also learn lots of new things, so let's get started.

This lesson is called recall one and two more or less than numbers to 10, and it's from the unit secure fluency of addition and subtraction facts within 10.

By the end of this lesson, you should be able to recall one and two more or less than numbers to 10.

Let's have a look at this lesson's keywords.

One more, one less, two more, and two less.

Let's practise.

My turn.

One more.

Your turn.

My turn.

One less.

Your turn.

My turn.

Two more.

Your turn.

My turn.

Two less.

Your turn.

Well done.

Now that we can say them, let's use them.

Let's have a look at the lesson outline.

In the first part of our lesson, we're going to be finding one more and one less than a number within 10.

And in the second part of our lesson, we're going to be finding two more and two less than a number within 10.

Let's get started.

In this lesson, you're going to meet Izzy, Jun, Aisha, and Sam.

They're gonna help us with our learning today.

Izzy lays out her digit cards to 10, but one of her cards is missing.

1, 2, 3.

Wait, Izzy, looks like Alex has got some advice for you.

You don't have to count in ones to work out which one is missing.

Hmm.

There's a much quicker way to work out which card is missing.

I wonder what Alex is thinking.

How could he work out which card is missing without counting from one in ones? Hmm.

Do you know what he's thinking? Alex explains to Izzy how he is going to work it out.

The cards are in order from one to 10, so we can use this to help us.

When we count to 10 in ones, we add one more each time.

So we can see this missing number is one more than five.

One more than five is six.

So Alex thinks that six is the missing number.

Did you think that too? Izzy now notices the pattern and she says that we could also see this as the number before seven, which would be one less than seven.

One less than seven is six.

So the missing number must be six.

Well done, guys.

Some really good use of your knowledge there.

Did you work it out using a similar method to Alex and Izzy? Alex now hides a digit card for Izzy.

Which number is missing now? Izzy can see this as the card after two.

So she says that this must be one more than two.

One more than two is three.

Izzy thinks the card is three.

Do you agree? Alex says that he could also see this as the number before four.

So one less than four.

One less than four is three.

So three is the missing card.

Well done, Alex and Izzy.

Did you get that? Okay, let's have a go at this game for ourselves because it's really gonna help us to practise our one more and one less.

So grab your number cards to 10 and make a line like this.

Work with a partner and turn over one digit card at a time and ask your partner to work out which one is missing.

Remember, explain how you are going to work out what the missing card is.

Remember, one more or one less is definitely going to help you with this task.

Have a play of that game and come on back when you're ready to continue.

I hope you did a super job with that game and are ready to continue our learning.

You might have done this.

Hmm.

We know that the card missing is after seven and before nine, so that means it must be one less than nine and one more than seven, which is both eight.

So the missing number must be eight.

Well done, Alex.

Alex explains to Izzy that the cards look just like a number line and when we find one more than a number, we can see this as the number after in our count.

So one more than six must be the number after six, which is seven.

So one more than six is seven.

When we find one less than a number, we can see this as the number before in our count or on our number line.

So one less than nine is I can think.

Hmm, the number before nine is eight.

So one less than nine must be eight.

Let's see if you can use that learning to solve these statements.

One less than five is, one more than nine is, one more than seven is, and one less than two is.

See if you can have a go at this without using your number line or counting on in your head.

Remember, we can see one more as the number after in our count and one less as the number before in our count.

Remember that tip as this will help you to solve these quickly.

Come on back once you've had a go.

Welcome back.

Let's have a look how you got on.

One less than five is, so I can see this as the number before five, which is four.

One more than nine is the number after nine is 10.

So one more than nine is 10.

One more than seven, so we can see this as the number after seven, which is eight and I can see that one less than two must be one because one is before two.

Well done if you got those correct.

If you didn't manage to do those without your number lines, keep practising until you are able to.

Izzy and Alex now use what they have learned to solve some equations.

Four plus one, one plus three, seven subtract one and six subtract one.

Alex has noticed something.

When we add one to a number, we can see this as the same as finding one more.

So four plus one we can see is one more than four, which is five.

Well done.

One plus three.

Hmm.

Izzy has noticed that we can add one in any order and we can still see this as the number after in our count.

So one plus three, it doesn't matter which order I'm adding that one, I can see this as one more than three, which is four.

Well done if you got that one.

Now, seven subtract one.

I'm looking at subtracting one now.

So when we subtract one from a number, we can see this as the same as one less.

So seven subtract one is the same as one less than seven, which is six because six is the number before seven.

So using that knowledge, what would six subtract one be? Six subtract one.

I can see this is one less than six or the number before six in my count, which is five.

Well done if you got those correct.

Okay, then, over to you then, pause this video and complete these equations for adding and subtracting one.

Remember those handy tips from Izzy and Alex from the slide before.

Come on back once you've had a go at all of them.

Well done, I hope you found those nice and easy after those tips from Alex and Izzy.

So let's have a look.

Eight plus one.

I can see that plus one is the same as the next number in my count or one more, which is nine, well done.

One plus six.

What was Izzy's handy tip for this one? We can add one in any order and we can still see this is the number after in our count.

Hmm.

Thanks, Izzy.

So six plus one must be the next number in my count, which is seven.

Well done.

Thank you for that, Izzy.

Three subtract one.

Hmm, what was Alex's tip for subtracting? We can see this as one less than three.

So one less than three is two.

Well done, Alex.

And 10 subtract one.

We can see this as one less than 10, which is nine.

Well done if you've got those correct.

And thank you to Alex and Izzy for their handy tips.

Okay, so over to you.

Let's practise this skill of finding one more and one less.

Another game for you to have a go at here.

So using the spinner, race your partner to the end of the number line.

So you can see I've got a number line to 10 with one counter for each player and I've got this spinner here.

What is all around my spinner? You may notice that there are lots of different ways of adding one, subtracting one, finding one more, finding one less or simply the equation add one or subtract one.

What you are going to do is you are going to take it in turns to spin the spinner and follow the instruction to move your counter.

Alex spins and gets one more than mm is mm.

We can see that he is on the number five, so he's going to think one more than five is six.

So he moves his counter one place.

So it's now at the number six.

Well done, Alex.

He's made his first move.

Now it's Izzy's turn.

Izzy spins the spinner and it lands on subtract one.

So five subtract one.

We can see this as the number before in our count, which is four.

So she moves her counter to four.

The winner will be the first person to make it all the way to either end of the number line and escape.

So if your counter goes all the way to the end and ends up here or the other end, so next to one, you are the winner.

Have a go at this game with your partner or on your own if you haven't got a partner and come on back when you're ready to continue the lesson.

Welcome back and thank you for coming back to join me as I know how fun that game is.

So let's see how Alex and Izzy have got on with their second spins.

Alex spins one less than mm is mm, so he's on six.

Oh, one less than six is five.

So he's going back to where he started.

Oh no, Alex.

Let's see what Izzy gets.

Subtract one again.

So Izzy, four subtract one is three.

So she's gonna move her counter down and she is one closer to the end.

I wonder who's going to win their game.

Well done if you were the winner in your game.

Right, let's move on to the second part of this lesson then, finding two more and two less than a number within 10.

Alex and Izzy have been keeping scores from their games that they've been playing to help their addition and subtraction facts and they're now comparing them to see how they're getting on.

So Alex has scored six points so far and Izzy has scored four points so far.

So how many more points does Alex have? Hmm.

How many more points does Alex have? Izzy has noticed that six is two more than four on the number line.

So that must mean that Alex has two more points.

Alex has noticed that four is two less than six on the number line, so that means that Izzy is two points behind.

Jun now adds his score to the number line.

He's scored two points so far.

Izzy has noticed that Jun has scored two less than her.

Alex notices that all of their scores are even.

What are the chances of that? Jun's score is two less than Izzy's score and Alex has scored two more than Izzy.

Hmm, all their scores, which are even numbers have a difference of two.

Did you remember that? Alex then explains what he and Jun have just remembered.

Two more than an even number is the even number after in our count.

So two more than six, we can see this as the even number after six, which is eight.

So two more than six would be eight.

Two less than an even number is the even number before in our count.

So if we were looking at two less than four is, we can see this as the even number before four, which is two.

So two less than four is two.

Right, let's have a go at this then.

Can you find the missing numbers to complete these statements? Two less than six is, two less than four is, two more than two is, and two more than eight is.

See if you can complete these without using a number line or counting on or back in your head.

Remember to use those handy tips from Alex and Jun from the previous discussion.

Pause this video and have a go at them.

Come on back when you're ready to see how you've got on.

Well done for having a go at those.

Let's see how you got on.

Two less than six is? Now, let's have a look.

Alex, can you help us out here? Two less than an even number.

We can see this as the even number before, so the even number before six is four.

So two less than six must be four.

Well done if you got that one.

So using that same knowledge, what would two less than four be? Two less than an even number is the even number before.

So what's the even number before four? Hmm, two.

Two less than four is two.

Well done.

Now let's have a look at some two more statements.

So two more than two is? What do we remember about two more? Hmm.

We can see two more than an even number is the even number after in our count.

So two more than two must be four and that means that two more than eight must be the number after eight in my even count.

2, 4, 6, 8, 10.

Well done if you got those four statements correct.

Izzy and Alex now play another game and share their new scores.

Izzy has scored five points so far and Alex has only scored three points so far.

How many more points does Izzy have? Alex has noticed that five is two more than three on the number line.

So he is two points behind Izzy.

Three is two less than five on the number line.

So that means that Izzy is two points ahead.

Aisha now adds her score to the number line.

Hmm.

Do we think she scored more or less? Aisha has scored seven points so far.

Wow, well done, Aisha.

Aisha has scored two more points than Izzy.

Izzy has noticed that now all their scores are odd but they still have a difference of two.

Two more than five is seven and two less than five is three.

Izzy has noticed that this was just like when they had even numbers as their scores.

Izzy now explains what she has noticed.

Two more than an odd number is the odd number after in our count.

So two more than one is we can see this as the next odd number after one, which is three.

So two more than one is three.

Two less than an odd number is the odd number before in our count.

So two less than seven.

We can see this as the odd number before seven, which is 1, 3, 5, 7.

Five is the missing part.

Two less than seven is five.

This is just like we've just done with our even numbers.

So let's have a go at finding the missing numbers to complete these statements, but this time, we're looking at our odd numbers.

Try to complete them again without using your number lines or counting on or back in your head.

Pause this video and have a go at completing the statements.

Come on back to see how you get on.

Right, I'm hoping that you notice that pattern that links to what we've just done with our even numbers, but now we're looking at it using our odd numbers.

We can see two less of an odd number as the odd number before in our count.

So the odd number before nine is seven.

Well done if you got that.

Two less than three must be the odd number before three, which is one.

Well done if you got those two correct.

Now, two more than five.

We can see two more than an odd number as the odd number after in our count.

We know that the odd number after five is seven, so two more than five is seven and two more than one is three.

Well done if you managed to do that without using your number line or counting on.

Izzy and Alex now use everything that they have learned to solve some equations.

Four plus two is equal to, two plus three is equal to, seven subtract two is equal to and six subtract two is equal to.

They are all adding and subtracting two.

So when we add two, so let's look at the first one, four plus two.

I know that four is an even number and as Alex is reminding me, when we add two to an even number, we can see this as the next even number.

So four plus two.

I know that the next even number is six.

Two plus three.

Hmm.

Oh, thank you, Izzy.

Izzy has reminded me that it doesn't matter which addend is two.

We can still see this as two more because addition is commutative.

We know that three is an odd number, so we can see this as two more than an odd number, which is the next odd number.

So two plus three must be equal to five.

Thanks for your help, guys.

Seven subtract two.

We can see seven is an odd number, so subtracting two from an odd number will give the odd number before, which I know is five.

Okay, then six subtract two.

What do we know? We know that six is an even number and when we subtract two from an even number, we can see this as the even number before.

So the even number before six I know is four.

So six subtract two must be equal to four.

So now for you to have a go at some of these, can you complete these by adding and subtracting two? Eight plus two, two plus five, three subtract two and nine subtract two.

Remember to think am I adding or subtracting and is it an odd or an even number because that's really going to help you to solve these.

Pause this video and come on back once you've had a go at them to see how you've got on.

Welcome back.

Let's see how you've got on.

Eight plus two.

I can see that eight is an even number and I'm adding two, so I can see this as the next even number after eight, which is 10.

Well done if you got that one.

Now, two plus five.

I think I might need some help, Izzy.

Yes, Izzy, we can add two in any order and still see this as the odd or even number after.

So five is an odd number, so the odd number after five is seven.

Two plus five is equal to seven.

Thanks for your help there, Izzy.

Now, three subtract two.

I know that subtracting two, we can see this as two less and I know that three is an odd number, so I'm looking for the odd number before three, which is one.

Three subtract two is equal to one.

And finally, nine subtract seven.

Well done, Alex.

Nine is an odd number, so we can see this as the odd number before in our count, which is seven.

Nine subtract two is equal to seven.

Well done if you got those correct and well done if you managed to use those strategies to help you.

Okay, then, over to you with task B and another game for you to practise adding and subtracting two.

You're going to need a set of digit cards and a set of our instruction cards.

You're going to work in your pair and one at a time, you're going to turn over a digit card and an instruction card.

You complete the instruction on the card and tell your partner your solution.

If you are correct, you get one point.

If you're incorrect, your partner has a chance to solve that problem and steal your point.

When you are finished with your turn, you turn the cards back over and it's then your partner's turn.

Just a little warning from Alex though.

If you turn over a one and any subtraction card, turn over a new digit as this learning hasn't been covered yet, but it's something that you will be learning in the future.

Pause this video and have a go at this game with your partner.

If you haven't got a partner, don't worry, you can play this game still on your own.

Come on back once you're ready to continue with the lesson.

Welcome back.

I hope you enjoyed that game and did lots of practising of adding and subtracting two.

Let's have a look how Izzy got on.

Izzy turned over this digit card and this instruction, so she completed four plus two.

She knows that four is an even number and adding two to an even number gives the next even number.

So four plus two is equal to six because six is the next even number after four.

Well done, Izzy.

I hope you had as much fun as Izzy did with that game.

Well done for all of your hard work with these games.

Remember, these games are really helpful to practise your skills, so if you want to play them away from this lesson, then go ahead.

Let's have a look at what we've been learning.

When we add one, we can see this as the number after in our count.

We can think of this as one more.

When we subtract one, we can see this as the number before in our count.

We can think of this as one less.

When we add two to an even or an odd number, we can see this as the even or odd number after in our count.

We can think of this as two more.

When we subtract two from an odd or even number, we can see this as the odd or even number before in our count.

We can think of this as two less.

Thank you for joining me in our lesson today.

You've done a great job.

I can't wait to see you again sometime.

Goodbye.