Write It Again and Solve
3 + 8 =
8 + 3 = 11
Decompose the second addend to make 10 with the first addend.
7 + 6 =
7 + 6 =
7 + 3 + 3 =13
How can you adjust the addends to find 18 + 37?
18 + 37 =
+2 -2 =
20 + 35 = 55
2 + 3 + 1 =
2 + 3 + 1 = 6
Use base-ten shorthand to solve.
26 + 35 =
26 + 35 = 61
11 + 20 =
20 + 11 = 31
Decompose the second addend to make 10 with the first addend.
8 + 6 =
8 + 6 =
8 + 2 + 4 =14
How can you adjust the addends to find 28 + 59?
28 + 59 =
+2 -2 =
30 + 57 = 87
10 + 5 + 5 =
10 + 5 + 5 = 20
Use base-ten shorthand to solve.
34 + 17 =
34 + 17 = 51
37 + 52 =
52 + 37 = 89
Decompose the second addend to make a double with the first addend.
8 + 9 =
8 + 8 + 1 = 17
How can you adjust the addends to find 48 + 34?
48 + 34 =
+2 -2 =
50 + 32 = 82
27 + 18 + 27 =
27 + 18 + 27 = 72
Use base-ten shorthand to solve.
34 + 49 =
34 + 49 = 83
49 + 34 =
34 + 49 = 83
Decompose one addend to find the sum.
58 + 24 =
58 + 24 =
58 + 20 + 4 = 82
How can you adjust the addends to find 58 + 54?
58 + 54 =
+2 -2 =
60 + 52 = 112
32 + 16 + 25 =
32 + 16 + 25 = 73
Use base-ten shorthand to solve.
64 + 29 =
64 + 29 = 93
29 + 64 =
64 + 29 = 93
Decompose both addends to find the sum.
58 + 27 =
58 + 27 =
50 + 8 + 20 + 7 =
50 + 20 = 70
8 + 7 = 15
70 + 15 + 85
How can you adjust the addends to find 78 + 44?
78 + 44 =
+2 -2 =
80 + 42 = 122
120 + 46 + 13 =
120 + 46 + 13 = 179
Use base-ten shorthand to solve.
27 + 27 + 17 =
27 + 27 + 17 = 72