Evaluate
4
Factor
2^{2}
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\frac{40}{70+20}\times 9
Add 40 and 30 to get 70.
\frac{40}{90}\times 9
Add 70 and 20 to get 90.
\frac{4}{9}\times 9
Reduce the fraction \frac{40}{90} to lowest terms by extracting and canceling out 10.
4
Cancel out 9 and 9.
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