Compare 4/10 and 20/21
4/10 is smaller than 20/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
4/10 = 4 × 21/10 × 21 = 84/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
20/21 = 20 × 10/21 × 10 = 200/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 84/210 < 200/210 or 4/10 < 20/21
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