Number houses (mixed)
A number house shows the ways to split one number into two parts: 56 is 20 + 36, 30 + 26 or 18 + 38. Finding the missing part is subtraction in disguise and builds number bonds for any number up to 100.
How to solve this
- A mixed number house uses both addition and subtraction to link the roof with each pair of floors.
- Read the operation sign above or beside each floor to know whether to add or subtract.
- Check that every floor satisfies the equation with the roof using the operation shown.
Examples
Number house 70: 30 + __
40
Number house 56: 20 + __
36
Practice problems with answers
Solve these problems on paper or out loud, then check the answer key. The online practice and the printable worksheet give a new set every time.
- Target 83: ___ + 22 = 83
- Target 66: 49 + ___ = 66
- Target 29: ___ + 22 = 29
- Target 46: 31 + ___ = 46
- Target 95: ___ + 26 = 95
- Target 52: 47 + ___ = 52
- Target 47: ___ + 33 = 47
- Target 91: ___ + 11 = 91
Show answers
- 61
- 17
- 7
- 15
- 69
- 5
- 14
- 80