Compare 81/42 and 70/20
1st number: 1 39/42, 2nd number: 3 10/20
81/42 is smaller than 70/20
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
81/42 = 81 × 10/42 × 10 = 810/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
70/20 = 70 × 21/20 × 21 = 1470/420 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 810/420 < 1470/420 or 81/42 < 70/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84 and 70/20 81/42 and 70/40 81/42 and 70/60