Question
Multiply: $\frac{-7}{10}\text{ by }\frac{-40}{21}$
✓
Answer
$\frac{-7}{10}\text{ by }\frac{-40}{21}$$=\frac{-7}{10}\times\frac{-40}{21}$
$=\frac{(-7)\times(-40)}{10\times21}$
$=\frac{(-1)\times(-4)}{1\times3}=\frac{4}{3}$
$=\frac{(-7)\times(-40)}{10\times21}$
$=\frac{(-1)\times(-4)}{1\times3}=\frac{4}{3}$
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