Grouping - Make 10s
Rearrange 36 + 15 + 4 to add
____ + ____ + ____
36 + 4 +15
40 + 15 = 55
Use a doubles fact to help solve 20 + 21
20 + 20 + 1 =
40 + 1 =
41
Use exanded form to add 38 + 61
(30 + 60) + (8 + 1) =
90 + 9 =
99
What number is 3 tens and 12 ones?
30 + 12 =
42
Use mental math to solve 54 - 30
24
Rearrange 1 + 7 + 9 to add
1 + 9 +7 =
10 + 7 =
17
Use a doubles fact to help solve 42 + 40
40 + 40 + 2 =
80 + 2 =
82
Use expanded form to add 124 + 21
100 + (20 + 20) + 1 =
100 + 40 + 1 =
141
What number is 5 tens and 26 ones?
50 + 26 =
76
Use mental math to solve 100 - 80
20
Rearrange 25 + 30 + 5 to add
25 + 5 + 30 =
30 + 30 =
60
Use a doubles fact to help solve 20 + 19
20 + 20 - 1 =
40 - 1 =
39
Use expanded form to add 28 + 33
( 20 + 30) + (8 + 3) =
50 + 11 =
61
What number is 1 hundred 2 tens and 13 ones
100 + 20 + 13 =
133
Use mental math to solve 86 - 33
53
Rearrange 8 + 15 + 22 + 5
8 + 22 + 15 + 5
30 + 20 =
50
Use a doubles fact to help solve 25 + 26
25 + 25 + 1 =
50 + 1 = 51
Use expanded form to add 13 + 24 + 61
(10 + 20 + 60) + (3 + 4 + 1) =
90 + 8 =
98
What number is 1 hundred and 13 tens?
100 + 130 =
230
Use mental math to solve 165 - 41
124
Rearrange 19 + 7 + 61 + 3 to add
19 + 61 + 7 + 3 =
80 + 10 =
90
Use a doubles fact to help solve 49 + 50?
50 + 50 - 1 =
100 - 1 =
99
Use expanded form to add 135 + 65
100 + (30 + 60) + (5 + 5) =
100 + 90 + 10 =
200
What number is 2 hundreds and 16 tens
200 + 160 =
360
Use mental math to solve 235 - 103
132