Compare 70/20 and 40/21
1st number: 3 10/20, 2nd number: 1 19/21
70/20 is greater than 40/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
70/20 = 70 × 21/20 × 21 = 1470/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
40/21 = 40 × 20/21 × 20 = 800/420 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 1470/420 > 800/420 or 70/20 > 40/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/20 and 80/21 70/40 and 40/21 70/20 and 40/42 70/60 and 40/21 70/20 and 40/63