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Connect multiplication and division facts and find unknowns using operation properties.
Free examples and worked answers. No account needed.
Practise the method.
Connect multiplication and division facts and find unknowns using operation properties.
Connect multiplication and division facts and find unknowns using operation properties.
Example 1
Use 10×4=40. What is 1040?
Show worked answer
Answer: 4
- Division undoes multiplication.
- 1040=4 because 10×4=40.
Example 2
Find □: 6×17=6×10+6× □.
Show worked answer
Answer: 7
- Distribute multiplication over addition: 6×(10+7)=6×10+6×7.
- Therefore □ =7.
Example 3
Find □: 9×21=9×10+9× □.
Show worked answer
Answer: 11
- Distribute multiplication over addition: 9×(10+11)=9×10+9×11.
- Therefore □ =11.
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