Starter quiz
- What is the total of 60 and 40?
- 110
- 100 ✓
- 101
-
- Which of these 2-digit numbers is a multiple of ten?
- 17
- 35
- 60 ✓
- 65
-
What is 100 subtract 4?- 6
- 6 tens
- 96 ✓
- 104
- 94
-
- 100 = 92 + ______
- '8' ✓
- Jacob has 75 football cards and wants 100 football cards. How many more football cards does he need?
- '25' ✓
- 100 subtract ______ equals 97
- 3 ✓
- 30
- 9
- 13
-
Exit quiz
- Which one is not a complement to 100?
- 32 + 68
- 36 + 74 ✓
- 35 + 65
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- What is the total of 67 + 33?
- '100' ✓
- Match the complements to 100
- 25⇔75 ✓
- 33⇔67 ✓
- 44⇔56 ✓
- 96⇔4 ✓
- What do you add to 71 to make 100?
- 39
- 29 ✓
- 19
-
- Complete the sentence: When the ones digits total 10 and the tens digits total ______ the two 2-digit numbers are complements to 100
- '90' ✓
- 55 + 55 = 100. Why is this calculation incorrect?
- The tens digits total less than 90
- The tens digits total more than 90 ✓
- The ones digits total more than 10
- The ones digit total less than 10
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Number facts to 10 can be applied to multiples of 10
- Using pairs to 10 and pairs to 100 we can find pairs to 100
- If we have a pair to 10 then the tens have to total 90 for the whole to be 100
- A number line can represent the complements to 100
Common misconception
Pupils may be less efficient if they are not fluent with bonds within 10 e.g. 3 + 6 = 9
Provide additional scaffolding as appropriate including examples of pairs that total 9 and 10
Keywords
Complement to 100 - Pairs of numbers which total 100
Total - The result of adding.
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