# Equivalent fractions to 21/5

Use this calculator to find equivalent fractions to any given input. You may have reached us looking for answers to questions like: Equivalent fractions to 21/5 or How to find the equivalent fractions for: 21/5.?

## How do you find equivalent fractions?

Two frations are equivalent when they have the same value when written in lowest terms. The fraction 42/10 is equal to 21/5 when reduced to lowest terms. To find equivalent fractions, just multiply the numerator and denominator of that reduced fraction (21/5) by any interger number, ie, multiply by 2, 3, 10, 30 ...

**42/10**is equivalent to 21/5 because 21 x 2 = 42 and 5 x 2 = 10**63/15**is equivalent to 21/5 because 21 x 3 = 63 and 5 x 3 = 15**84/20**is equivalent to 21/5 because 21 x 3 = 84 and 5 x 3 = 20

Equivalent fractions may look different, but when you reduce then to the lowest terms you will get the same value. If any fraction is not reduced to lowest terms, you can get other equivalent fractions just dividing both numerator and denominator by the same number.

## How to know if two fractions are equivalent?

If you want to check if two fractions are equivalent, you can use this Rule:

*Two fractions (a/b and c/d) are equivalent when the product of the numerator (a) of the first fraction and the denominator (d) of the second fraction is equal to the product of the denominator (b) of the first fraction and the numerator (c) of the second fraction.*

That is, by cross-multiplying (a/b = c/d) the equality will remain, i.e, a.d = b.c. So, here are some examples:

**42/10**is equivalent to 21/5 because 42 x 5 = 10 x 21 = 210**63/15**is equivalent to 21/5 because 63 x 5 = 15 x 21 = 315**84/20**is equivalent to 21/5 because 84 x 5 = 20 x 21 = 420

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