Addition within 20
Add 4+4
8
Subtract 2-1
1
Sally bought 5 cookies. She ate 3 cookies. How many cookies does she have left?
2
Add:
70+20
Subtract
20
- 10
10
Add 7+5
12
1
Mary had 3 cows. She bought 9 more. How many does she have in all?
12
Add
30
+40
70
Subtract
40-20
20
Add 8+6
14
Subtract 15-8
7
John has 30 Pokemon cards. He bought 20 more. How many Pokemon cards does he have in all?
Add
70
+40
110
Subtract
60
-20
40
Add 9+8
17
Subtract 19-9
10
There are 30 pine trees in the park. 10 pine trees are cut down. How many trees are left?
20
Add
60
+ 40
100
Subtract
90
-60
30
20
Subtract 20-10
10
Jessica had 50 watermelons. She was given 20 watermelons. How many does she have in all?
70
Add
90
+10
100
Subtract
86
-26
60