Think on your feet and find the missing numbers in these subtraction equations.

In this matching game, first graders look at subtraction facts that are missing factors.

Kids hone their single-digit addition skills as they match equations with their missing factors.

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

Dive for treasure and missing factors in this online game featuring addition equations.

Fill in these addition facts! This game challenges kids to match missing addends to each equation.

Which number is missing? Click on the number that fits each addition expression and win the race.

Children hone their knowledge of addition and missing addends in a race to reach the sunken treasure.

In this water-themed race, first graders use math and logic to fill in each addition equation.

Children use their addition knowledge to complete equations in a race to reach the sunken treasure.

Kids compare objects by their length and height to place them in the correct order.