Compare 21/90 and 18/56
21/90 is smaller than 18/56
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 56 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 90 × 28 = 2520,
21/90 = 21 × 28/90 × 28 = 588/2520 - Likewise, for the 2nd fraction, since 56 × 45 = 2520,
18/56 = 18 × 45/56 × 45 = 810/2520 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 588/2520 < 810/2520 or 21/90 < 18/56
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