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

Help second graders learn about addition facts to 20 in this online matching activity.

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

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

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

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