Practice part-part-whole skills and decomposing numbers with this game.
If using 100 as your whole, each pair of partners needs 9 tens and 10 ones. They can use connecting cubes or base ten blocks.
One partner covers up some of these cubes (they might cover up 45) and leave the rest (55) in view. The other partner has to figure out what is covered up by knowing the whole (100) and one of the parts. They fill in the part-part-whole box, check to see if they were right, and then switch. A new person hides a part.
This is great to strengthen place value, mental math, and problem solving skills.
This game can be differentiated among your students. There are also other sheets with different wholes: 20, 50, 500 so you can use a number that is right for your student's ability.
For 20, they need 10 ones and 1 ten. For 50, they need 4 tens, and 10 ones. For 500, they need 10 ones, 4 hundreds, and 9 tens.