Compare 20/5 and 81/18
1st number: 4 0/5, 2nd number: 4 9/18
20/5 is smaller than 81/18
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
20/5 = 20 × 18/5 × 18 = 360/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
81/18 = 81 × 5/18 × 5 = 405/90 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 360/90 < 405/90 or 20/5 < 81/18
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