Compare 42/70 and 2/21
42/70 is greater than 2/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
42/70 = 42 × 3/70 × 3 = 126/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
2/21 = 2 × 10/21 × 10 = 20/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 126/210 > 20/210 or 42/70 > 2/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70 and 2/21 42/70 and 4/21 42/70 and 2/42 42/70 and 6/21 42/70 and 2/63 42/70 and 10/21 42/70 and 14/21