Compare 15/42 and 90/40
1st number: 15/42, 2nd number: 2 10/40
15/42 is smaller than 90/40
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
15/42 = 15 × 20/42 × 20 = 300/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
90/40 = 90 × 21/40 × 21 = 1890/840 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 300/840 < 1890/840 or 15/42 < 90/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42 and 90/40 15/84 and 90/40 15/42 and 90/80 45/42 and 90/40 75/42 and 90/40