KS1 Maths Quiz
10 + 90, 20 + 80, 30 + 70, 40 + 60 and 50 + 50 all add up to 100.

# Year 2 Calculation - Addition and Subtraction Facts to 100

This quiz addresses the requirements of the National Curriculum KS1 Maths and Numeracy for children aged 6 and 7 in year 2. Specifically this quiz is aimed at the section dealing with knowing number facts to 100.

Knowing addition and subtraction facts by heart means being able to quickly know the pairs of numbers which make a total of 100, as well as the associated subtraction facts. This knowledge of the number pairs, or bonds, to 100 can be linked to knowing the number pairs to 10. For example, if you know that 3 + 7 = 10, then you may realise that 30 + 70 = 100.

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1. Question 1

If you know that 2 + 8 = 10, what else do you know?
80 + 20 would also give 100
2. Question 2

Which 'family' of facts is incorrect?
65 + 45 = 110, so all the other facts must be incorrect too
3. Question 3

Which of the following is true?
60 + 40 gives an answer which is ten times bigger than 6 + 4
4. Question 4

Which number fact is incorrect?
6 + 40 = 46!
5. Question 5

Which number is missing: 10 + ? = 100
10 + 90 = 100, so 90 + 10 = 100 also
6. Question 6

Which three pairs of numbers all add up to 100?
All the others give different totals
7. Question 7

Which one of the following number pairs do not add up to give 100?
20 + 18 = 38
8. Question 8

Which of the following is true?
100 - 80 = 20 is the other subtraction fact for these numbers
9. Question 9

Which 'family' of facts is incorrect?
60 + 50 = 110, so all the other facts must be incorrect too
10. Question 10

Which of these three other facts go with 30 + 70 = 100?
For the subtraction facts, the largest number should be at the beginning

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