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Common Core State Standard

5.OA.A.2

Write simple expressions that record calculations with numbers, and interpret numerical expressions without evaluating them. For example, express the calculation “add 8 and 7, then multiply by 2” as 2 × (8 + 7). Recognize that 3 × (18932 + 921) is three times as large as 18932 + 921, without having to calculate the indicated sum or product

CCSS: 5.OA.A.2
Keep the aircraft away from the city by answering expressions using addition, subtraction, multiplication and divison problems.  Strategically eliminate the bonus planes to help you get through all of the levels.

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!