Students in my class use this activity mat when practicing how to subtract multiples of ten. (Common Core Standard 1.NBT.C.6)
Partner 1 selects a number and writes it in the first box. Partner 1 also should represent that number with place value rods beneath it.
Partner 2 selects a number smaller than the first to write in the second box. Partner 2 then crosses out that many place value rods and writes the correct answer.
Students roles can alternate each problem.
This game could also be altered and number cubes could be used. Students would need to make the number a multiple of ten to work. (Example: 4=40) A ten sided number cube would be best.
This activity could be adapted to work for numbers 0-20 as well.