Multiply: $\left(\dfrac{10}{7}\right)\left(\dfrac{-1}{3}\right)$.
A$\dfrac{30}{7}$
B$\dfrac{10}{21}$
C$-\dfrac{10}{21}$
D$-\dfrac{10}{10}$
Answer & Solution
Correct answer: C. $-\dfrac{10}{21}$
To multiply fractions: multiply numerators, multiply denominators.
$\dfrac{10 \cdot (-1)}{7 \cdot 3} = \dfrac{-10}{21} = -\dfrac{10}{21}$.
- Trap C drops the negative.
- Trap B miscombines numerators.
- Trap D adds denominators or computes incorrectly.
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