### 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.