Compare 12/70 and 21/81
12/70 is smaller than 21/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 81 is 5670
Next, find the equivalent fraction of both fractional numbers with denominator 5670 - For the 1st fraction, since 70 × 81 = 5670,
12/70 = 12 × 81/70 × 81 = 972/5670 - Likewise, for the 2nd fraction, since 81 × 70 = 5670,
21/81 = 21 × 70/81 × 70 = 1470/5670 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 972/5670 < 1470/5670 or 12/70 < 21/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/70 and 21/81 12/70 and 42/81 36/70 and 21/81 12/70 and 63/81 60/70 and 21/81 84/70 and 21/81