An equation has an equal sign. It shows that what is on the left of the equation is equal to what is on the right.

Use number facts to add or subtract a one-digit number and a two-digit number.

Maths

In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction. In the future unit pupils will learn to find 10 more or less than a 2-digit number They will  add and subtract 10 to/from a 2-digit number using number facts

In the prior unit pupils added 3 addends. They used strategies such as finding 2 addends to total 10 or 2 numbers to bridge though 10. In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.

Adding and subtracting ones and tens to and from 2-digit numbers

Which equation would come next in the pattern? 

Which known fact could be used to solve the equation shown on the number line?

Which of the following equations can be solved using the known fact 3 + 5 = 8?

Which number will make both of the following equations correct?

Match the missing number equations to the correct answer.

Which decade is missing on the number line?

Alex subtracts 1 from these Base 10 blocks. Which image shows the number he now has?

Alex taps one more than the number shown. What number does he tap?

Which of the following could be Sam’s number?

Alex thinks of a two-digit number. It is 1 less than a multiple of ten. It is greater than 80 but less than 90      What is his number?

This lesson will soon be taken down.

Use number facts to add or subtract a one-digit number and a two-digit number.

Lesson outcome