Missing number questions.
Revision of "missing number" problems. A missing number can be anywhere in an addition sentence (e.g. 5+5 = _ or 5+__=7 or __+3=10)
100 square splat
Use the 100 square to help figure out the answer. Place your finger on the number and count on. Or place your finger on the answer and count back.
Missing number addition and subtraction