Compare 18/70 and 21/72
18/70 is smaller than 21/72
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 72 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 70 × 36 = 2520,
18/70 = 18 × 36/70 × 36 = 648/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
21/72 = 21 × 35/72 × 35 = 735/2520 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 648/2520 < 735/2520 or 18/70 < 21/72
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