Solve all of the problems using either addition or subtraction strategies.
65+20=?
40-10=?
What is addition?
Combining numbers, putting numbers together
Decomposing numbers, taking numbers apart
What is subtraction?
46+32=?
39+24=?
54-13=?
70-45=?
674+218=?
583+357=?
800-516=?
607- 482=?
158+163=?
745-511=?