math
posted by esther on .
These numbers form an addition and subtraction fact family. 6, 7, 13
Choose the fact family formed by these numbers.
7 + 13 = 20
13 + 7 = 20
13 – 13 = 0
13 – 0 = 13
7 + 0 = 7
6 + 0 = 6
13 – 0 = 13
13 – 13 = 0
7 + 0 = 7
6 + 0 = 6
13 – 0 = 13
13 – 13 = 0
7 + 6 = 13
13 = 7 + 6
13 – 6 = 7
7 = 13 – 6

7 + 6 = 13
13 = 7 + 6
13 – 6 = 7
7 = 13 – 6