### Unit 2-2 Addition & Subtraction Fact Families

```© 2007 M. Tallman
3+4=7
3+4=7
sum
7
sum
7
sum
3
4
6+2=8
2+6=8
8–2=6
8–6=2
3+6=9
6+3=9
9–6=3
9–3=6
5+2=7
2+5=7
7–2=5
7–5=2
9 + 2 = 11
2 + 9 = 11
11 – 2 = 9
11 – 9 = 2
Use what you know about fact families
to solve for the unknown variable.
7+8=k
h + 7 = 15
15 – 7 = h
15 - 8 = s
k = 15
h=8
h=8
s=7
Use what you know about fact families
to solve for the unknown variable.
9+3=y
x + 9 = 12
12 – x = 9
12 - 3 = v
y = 12
x=3
x=3
v=9
Use what you know about fact families
to solve for the unknown variable.
8+9=a
9 + b = 17
17 – 8 = c
a-9=8
a = 17
b=8
c=9
a = 17
Find the sum or difference, then write
the related number sentences.
5 + 7 = 12
7 + 5 = 12
12 – 7 = 5
12 - 5 = 7
Find the sum or difference, then write
the related number sentences.
24 - 7 = 17
24 - 17 = 7
17 + 7 = 24
7 + 17 = 24
Find the sum or difference, then write
the related number sentences.
36 - 25 = 11
36 - 11 = 25
11 + 25 = 36
25 + 11 = 36
Find the sum or difference, then write
the related number sentences.
9 + 9 = 18
18 – 9 = 9
Write the fact family for the set of numbers.
4, 5, 9
4+5=9
5+4=9
9-4=5
9-5=4
Write the fact family for the set of numbers.
12, 24, 36
12 + 24 = 36
24 + 12 = 36
36 - 12 = 24
36 - 24 = 12
Write the fact family for the set of numbers.
26, 17, 43
26 + 17 = 43
17 + 26 = 43
43 - 17 = 26
43 - 26 = 17