About this game

Find the missing number

Find the missing number: a free Grade 2 math game for ages 7-8. Each round draws 8 questions; instructions are read aloud and every answer is checked and explained.

Aligned with

  • 2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
  • 2.OA.B.2 Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

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