Fact Families
What is the missing fact in this fact family?
8 + 2 = 10
2 + 8 = 10
10 - 2 = 8
10 - 8 = 2
9 - 6 = ?
3
9 + 9 = ?
18
There are 13 birds in a tree. Then 9 birds fly away. How many are still in the tree?
Name one addition fact related to this subtraction fact.
16 - 7 = 9
9 + 7 = 16 or 7 + 9 = 16
20 - 10 = ?
10
7 + ? = 15
8
Nina bakes 14 corn muffins. She gives 8 away. There are 6 left. Which equation matches the story?
A) 15 - 8 = 7
B) 7 + 8 = 15
C) 14 - 8 = 6
D) 8 + 6 = 14
C) 14 - 8 = 6
Name one subtraction fact related to this addition fact:
5 + 6 = 11
11 - 6 = 5 or 11 - 5 = 6
13 - ? = 7
6
? + 0 = 7
7
A box has 16 skateboard parts. Maria used some of the parts. Now there are 7 parts left. How many parts did Maria use?
16 - 7 = 9 parts