NAME ______________________________ DATE _______________
ACTIVITY
(PAGE 1 OF 4)
Solve the problems.
1 Build 20.
Remove 10.
How many now?
_______________ − _______________ = _______________
2 Build 30.
Add 10.
How many now?
_______________ + _______________ = _______________
3 Build 60.
Add 30.
How many now?
_______________ + _______________ = _______________
4 Build 50.
Remove 20.
How many now?
_______________ − _______________ = _______________
5 Build 30.
Add 20.
How many now?
_______________ + _______________ = _______________
6 Build 50.
Remove 30.
How many now?
_______________ − _______________ = _______________