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If you know that 22 + 8 = 30 it will help you to solve 30 - ? = 22.
Year 2 Calculation - Missing Number Problems
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 using known facts to solve missing number problems.
Using facts to solve problems means understanding that subtraction is the inverse of addition, and vice versa. Therefore, if you know that 6 + 4 = 10, you could find the missing number in 10 - ? = 4 by using the same numbers.
This quiz will help your child to solve missing number problems by using number facts known to them.
Question 1
Which fact would help you solve:
10 - ? = 4
10 - ? = 4
8 + 2 = 10
10 + 4 = 14
4 + 6 = 10
10 + 6 = 16
If 4 + 6 = 10, then 10 - 6 = 4
Question 2
You could use 100 - 25 = 75 to help you solve:
25 + 75
75 - 25
75 - 100
25 - 100
If you know that 100 - 25 = 75, then you could solve 25 + 75 = 100
Question 3
You could use 45 + 55 = 100 to help you solve:
100 - 5
40 + 500
100 - 20
100 - 55
If 45 + 55 = 100, you could solve 100 - 55 = 45
Question 4
If 15 + 85 = 100 is true, which of the following is not true?
100 - 15 = 85
100 - 85 = 100
100 - 85 = 15
85 + 15 = 100
100 - 85 = 15, not 100
Question 5
What is the missing number:
20 - ? = 7
20 - ? = 7
70
30
3
13
If 7 + 13 = 20, then 20 - 13 = 7
Question 6
What is the missing number:
12 + ? = 20
12 + ? = 20
18
8
22
12
12 + 8 is a number pair, or bond, to 20
Question 7
If 16 + 84 = 100 is true, which of the following is not true?
84 + 16 = 100
100 - 84 = 16
16 + 16 = 84
100 - 16 = 84
16 + 16 = 32, not 100
Question 8
Which number is missing:
100 - ? = 20
100 - ? = 20
12
18
20
80
20 + 80 = 100 so 100 - 80 = 20
Question 9
If 95 + 5 = 100 is true, which of the following is not true?
95 + 95 = 100
5 + 95 = 100
100 - 95 = 5
100 - 5 = 95
The numbers in each calculation should always be 5, 95 and 100
Question 10
Which number is missing:
? + 5 = 20
? + 5 = 20
50
15
5
20
20 - 5 = 15, so 15 + 5 = 20
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