Starter quiz
- 50 is composed of how many tens?
- '5 ' ✓
- 100 is composed of 7 tens and ______ tens.
- '3' ✓
- What is the total of 60 and 4 tens?
- 40
- 140
- 100 ✓
- 60
-
- If I know that 2 + 8 = 10 what else do I know?
- 8 + 2 = 10 ✓
- 2 − 8 = 10
- 10 − 2 = 8 ✓
- 8 + 10 = 2
-
- Izzy was running 100 m. She fell over at 60 m. How many more metres did she have to run?
- '40 ' ✓
- 30 + 2 tens + 50 = __________
- 10 tens ✓
- 8 tens
- 2 tens
- 5 tens
-
Exit quiz
- 25 + 75 = ___
- 25
- 75
- 10
- 100 ✓
-
- Which of these 2-digit numbers is a multiple of ten?
- 25
- 75
- 50 ✓
- 100
-
What is 100 subtract 6? Use the number square.- 40
- 4 tens
- 14 tens
- 94 ✓
- 96
-
- 100 = 93 + ______ ?
- '7' ✓
- Two 2-digit numbers total 100. If the first number has 10 ones, the second number is ...
- 100
- 10
- 90 ✓
-
- Do these addends total 100? 73 + 37
- Yes, they total 100
- No, because the one digits do not total 10
- No, because the tens digits do not total 90 ✓
-
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
- 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.
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