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Use addition and subtraction relationships to find unknowns and keep equations equal.
Free examples and worked answers. No account needed.
Practise the method.
Use addition and subtraction relationships to find unknowns and keep equations equal.
Use addition and subtraction relationships to find unknowns and keep equations equal.
Example 1
122− □ =71. What is □?
Show worked answer
Answer: 51
- The removed amount is the difference: 122−71=51.
Example 2
21+106=62+ □. What is □?
Show worked answer
Answer: 65
- The left side totals 127.
- Subtract the known right-side addend: 127−62=65.
Example 3
93− □ =68. What is □?
Show worked answer
Answer: 25
- The removed amount is the difference: 93−68=25.
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