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Addition practice

Missing-addend addition

Find an unknown first or second addend in horizontal equations with selectable blank symbols.

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Identify the known part and the whole. Subtract to find the missing addend, then check the completed sum.

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Learning objective

What this activity builds

Use the relationship among two parts and a whole to solve addition equations with an unknown value.

Worked example

Complete 17 + □ = 31.

14

The missing addend is the difference between the whole and the known part: 31 − 17 = 14.

Teaching notes

Make the practice count

  • Name the role of the blank before choosing an operation.
  • Check the completed equation by substituting the answer.

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Math SheetNameScore/ 20TeacherDateMissing Addend AdditionFind the missing addend that makes each equation true.1.13 + ____ = 472.19 + ____ = 553.____ + 36 = 634.24 + ____ = 485.____ + 38 = 596.____ + 10 = 217.____ + 20 = 368.24 + ____ = 349.17 + ____ = 3510.27 + ____ = 6211.13 + ____ = 3712.____ + 17 = 4413.30 + ____ = 5714.33 + ____ = 6815.40 + ____ = 6116.29 + ____ = 6417.____ + 24 = 5918.31 + ____ = 4319.36 + ____ = 6820.21 + ____ = 37math-sheet.comPage 1 / 1

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