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

Reinforce your child's three-digit addition skills with this ski-themed learning adventure!

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

What’s the sum? Add 10 to that number in a three-digit addition game for second graders.

Build up second graders’ math knowledge with a diving game about three-digit addition.

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

Kids practice two-digit addition to 100 in this action-packed number line game.

Are you ready to add 10 to numbers over 100? Reinforce students’ learning in this ski-themed game.

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

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