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

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

Kids practice matching each addition equation to its missing factor in this interactive math game.

First graders match the cards that equal the same value in this mental math matching game.

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