New
New
Year 3
Use known facts to find pairs of numbers that total 100
I can use known facts to find pairs of numbers that total 100
New
New
Year 3
Use known facts to find pairs of numbers that total 100
I can use known facts to find pairs of numbers that total 100
Lesson details
Key learning points
- Number facts to 10 can be applied to multiples of 10
- If 3 plus 2 is equal to 5 then 3 tens plus 2 tens is equal to 5 tens.
- When you add a single digit to a multiple of ten, only the ones digit changes.
Common misconception
Pupils lack fluency in pairs for 10 and so struggle to connect this to 2-digit numbers.
Promote fluency through games and chants and consider providing a scaffold of pairs for 10 for pupils to use which automaticity develops.
Keywords
Total - A total is the result of adding.
2-digit number - A 2-digit number refers to a value between 10 and 99. The number is made up of two digits which represent tens and ones.
This lesson provides an opportunity to review, rehearse and apply pairs that total 10 in a different context. It is important that pupils see that they are using previously learned facts in a new way. Make that step in thinking clear in the lesson.
Teacher tip
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
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6 Questions
Q1.
50 is composed of how many tens?
Q2.
100 is composed of 7 tens and tens.
Q3.
What is the total of 60 and 4 tens?
40
140
60
Q4.
If I know that 2 + 8 = 10 what else do I know?
2 − 8 = 10
8 + 10 = 2
Q5.
Izzy was running 100 m. She fell over at 60 m. How many more metres did she have to run?
Q6.
30 + 2 tens + 50 = __________
8 tens
2 tens
5 tens
Exit quiz
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6 Questions
Q1.
25 + 75 = ___
25
75
10
Q2.
Which of these 2-digit numbers is a multiple of ten?
25
75
100
Q3.
What is 100 subtract 6? Use the number square.
40
4 tens
14 tens
96
Q4.
100 = 93 + ?
Q5.
Two 2-digit numbers total 100. If the first number has 10 ones, the second number is ...
100
10
Q6.
Do these addends total 100? 73 + 37
Yes, they total 100
No, because the one digits do not total 10