Friendly Numbers
What is 10 + 10
20
3 + _ = 6
3
1 + 3 = _ + 2
2
3 + 4 =
7
10 - 5 =
5
What is 20 + 20
40
_ + 4 = 8
4
5 + _ = 2 + 8
5
6 + 9 =
15
7 - 3 =
4
What is 30 + 20
50
8 + _ = 16
8
7 + _ = 5 + 5
3
14 + 11 =
25
17 - 9 =
8
What is 50 + 50
100
18 - _ = 9
9
6 + 6 = 10 + _
2
27 + 15 =
42
28 - 13 =
15
What is 120 + 70
190
21 - _ = 10
11
20 - 6 = 7 + _
7
42 + 33 =
75
69 - 32 =
37