One student calls out an answer while other erases the problem. You could play this same game with number bonds to 20. Can be multiplication or division bonds/models. Play on dry erase boards.

Mrs. T's First Grade Class: Numbers in expanded notation. When you put the cups together, you see the number. When you take them apart, you see the place value of each digit! Great concrete idea for those that need it!

10 Maths ideas | math classroom, 1st grade math, 2nd grade math