Adding Tens
10 + 70 =
80
13 + 3 =
16
24 + 22 =
46
25 + 20 =
45
Mrs. Byle baked 10 cookies. Mrs. McWatters baked 20 cookies. How many cookies did they bake in all?
30
20 + 30 =
50
15 + 5 =
20
33 + 33 =
66
50 + 50 =
100
Mrs. Blake counted 10 ladybugs. Mrs. Kirby counted 2 butterflies. Ms. Fauver counted 5 crickets. How many bugs did they count altogether?
17
40 + 40 =
80
19 + 4 =
23
52 + 34 =
86
25 + 25 =
50
There were 15 children on the playground. 10 of them were boys. How many were girls?
5
90 + 20 =
110
18 + 9 =
27
75 + 24 =
99
14 + 56 =
70
There were some birds in the tree. 4 more landed in the tree, and then there were 12 altogether. How many birds were in the tree at first?
8
40 + 70 =
110
14 + 9 =
25
87 + 13 =
100
57 + 29 =
86
There were 19 apples growing on the tree. Some of them fell off. Then there were 8 apples still on the tree. How many apples fell off?
11