Missing Number Quiz

About this quiz

Find the missing number in addition and subtraction equations, such as □ + 8 = 15, within 10, 20, or 100.

  • Choose a limit of 10, 20, or 100, and whether 0 can appear.
  • Answer 10, 20, or 30 flash cards, one at a time, while a timer runs.
  • At the end, review your score, time, and every mistake, then practice just the cards you missed.
  • For Grades 1–2 · Common Core 1.OA.D.8, 2.OA.B.2

Worked example

7 + 8 = 15

Undo the addition: 15 − 8 = 7.

Tip: Use the opposite operation: a missing addend is found by subtracting.

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