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exttt{ $-3$ / $5$ } express as exttt{ $20$ } denominator

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Least common denominator

Full solution

Q. exttt{

-3

/

5

} express as exttt{

20

} denominator

Find number for multiplication: Find a number that when multiplied by $5$ gives $20$ . $\newline$ $5 \times 4 = 20$
Multiply fraction by common factor: Multiply both the numerator and denominator of $-\frac{3}{5}$ by $4$ to keep the value of the fraction the same. $\newline$ $\left(-3 \times 4\right) / \left(5 \times 4\right) = -\frac{12}{20}$

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