Subtract 42/90 from 3/35
3/35 - 42/90 is -8/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 35 × 18 = 630,
3/35 = 3 × 18/35 × 18 = 54/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Subtract the two like fractions:
54/630 - 294/630 = 54 - 294/630 = -240/630 - After reducing the fraction, the answer is -8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/35-42/90 3/35-84/90 3/70-42/90 9/35-42/90 15/35-42/90 21/35-42/90