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

Addition experts, come on down! Practice quick-thinking two-digit addition in this educational game that tests off-the-cuff adding skills.

Children dig up dinosaur fossils by adding 10 to multiples of 100 in this prehistoric game.

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

Kids help Elliott prepare treasures for her museum by answering word problems by using a tape diagram.