Challenge: missing numbers. What 2 numbers add together to make the answer? You could also use the inverse of subtraction to help you. 12 + ? = 20, 20 - 12 = 8, so the missing number is 8.
1. 18 + ? = 20
2. 17 + ? =18
3. 4 + ? = 10
4. 6 + ? = 14
5. 1 + ? = 19
Arithmetic answers
1. 20
2.23
3.19
4.10
5.7
6.19
7.13
8.2
9.7
10.5
Challenge
1.2
2.1
3.6
4.8
5.18
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