Addition within 20
8+3=
20-19=
1
6+5=11
11 Popits.
Rajun solved 20-15. He used the number line and started at 20, and counted back 15 spaces. What strategy is this?
Counting back
15-9=
6
14+6=
20
13-9=
4
St. Mary's has 20 busses. Diamond has 17 busses. How many fewer busses does Diamond have than St. Mary's?
20-17=3
3 busses
Naveen solved 14-7. She did this by setting up the following addition problem: 7+___=14. What strategy did she use?
Adding to subtract
18
0+9=
9
14-3=
11
Paris had a bag of 13 skittles. She ate 7. She wanted to eat 6 more. Will she have enough left over to eat 6 more?
Yes.
13-7=6
She will have enough left to eat 6.
Mitavious solved 6+8. He did this by starting at 8 and counting forward 6 more. What strategy is this?
Counting on strategy.
11+6=
17
17+3=
A'Leigha has 11 LOL dolls at home. Amiyah has 8 LOL dolls. How many LOL dolls to Amiyah and A'Leigha have total?
11+8=19
19 LOL dolls
Adding to subtract.
16-11=
5
13+5=
18
20-13=
7
Azaria collected 15 stickers. Na'Veen collected 20 stickers. How many fewer stickers does Azaria have than Na'Veen?
20-15=5
5 stickers
Larry solved 16-9. He used the addition problem: 9+___=16 to solve. What strategy did he use?
20-19=
1