All aboard! Kids solve addition problems on a number line using 1, 10, and 100 unit manipulatives.

Add 100 to three-digit numbers and find the matching sums in this exciting Dino Fishing game.

Get ready to add 10 more! Analyze expressions like "110 + 10" and calculate three-digit sums.

Kids practice addition and subtraction with manipulatives in this silly shopping game.