Compare 21/36 and 70/90
21/36 is smaller than 70/90
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 36 × 5 = 180,
21/36 = 21 × 5/36 × 5 = 105/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
70/90 = 70 × 2/90 × 2 = 140/180 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 105/180 < 140/180 or 21/36 < 70/90
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