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Number bonds practice

Horizontal number bonds

Find one missing part in two-part equations with a fixed whole from 5 to 100, six equation layouts and up to 30 problems.

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Find the missing part in each number bond equation.

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US Letter

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A4

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Learning objective

What this activity builds

Use the whole-and-parts relationship to find an unknown addend and check it with addition.

Worked example

What completes __ + 7 = 10?

3

The whole is 10 and one part is 7. Count from 7 to 10 or subtract 10 − 7. The missing part is 3 because 3 + 7 = 10.

Teaching notes

Make the practice count

  • Begin with a whole of 10 and counters, then move to 20 when pairs to 10 are secure.
  • Ask learners to name the whole and known part before calculating. The same relationship works when the whole is printed on the left.
  • A small whole has only a few possible pairs of parts, so a long sheet may repeat a pair only after every possible pair has appeared. Mixed formats balance the two blank positions.

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Math SheetNameScore/ 20TeacherDateHorizontal number bondsFind the missing part in each number bond equation.1.+19=202.+6=203.+4=204.+8=205.+14=206.+1=207.+7=208.+18=209.+10=2010.+0=2011.+3=2012.+13=2013.+11=2014.+20=2015.+15=2016.+5=2017.+9=2018.+16=2019.+12=2020.+2=20math-sheet.comPage 1 / 1

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