Compare 21/42 and 70/45
1st number: 21/42, 2nd number: 1 25/45
21/42 is smaller than 70/45
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
21/42 = 21 × 15/42 × 15 = 315/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
70/45 = 70 × 14/45 × 14 = 980/630 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 315/630 < 980/630 or 21/42 < 70/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/84 and 70/45 21/42 and 70/90 63/42 and 70/45