Common Core State Standard
1.OA.D.8
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ – 3, 6 + 6 = _.

CCSS: 1.OA.D.8
These dogs are pretty smart and have a disappearing act at the circus. Help them with their act by using your adding skills to get them to the right platform. Three skill levels to choose from.

CCSS: 1.OA.D.8
Make blocks disappear by dropping Result and Add blocks in such a way that the Add block's total equal the Result block. This can be done in 8 directions for combo chains.

CCSS: 1.OA.D.8, 3.OA.A.4
Choose to race in the addition/subtraction, multiplication or division category and complete all 5 races. The faster you solve the equations the faster you run.

CCSS: 1.OA.D.8
Help little Chipacabra build the largest equations possible in this fun math platformer. The larger the answers the better your score.

CCSS: 1.OA.D.8, 3.OA.A.4, 3.NF.A.3b, 4.OA.C.5, 5.OA.A.2, 6.EE.A.2
Choose to practice 1 of 8 skills from addition all the way up to algebra. Whatever skill you choose, you'll need to use that skill to save the people from the monsters, aliens and more!

CCSS: 1.OA.D.8, 3.OA.A.4
Solve the equations by popping the correct numbered bubble. Starts out with addition and subtraction and then moves to multiplication and division. Don't forget to use the power-ups.