Compare 70/81 and 40/80
70/81 is greater than 40/80
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 80 is 6480
Next, find the equivalent fraction of both fractional numbers with denominator 6480 - For the 1st fraction, since 81 × 80 = 6480,
70/81 = 70 × 80/81 × 80 = 5600/6480 - Likewise, for the 2nd fraction, since 80 × 81 = 6480,
40/80 = 40 × 81/80 × 81 = 3240/6480 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 5600/6480 > 3240/6480 or 70/81 > 40/80
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