Subtract 42/90 from 36/70
36/70 - 42/90 is 1/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
36/70 = 36 × 9/70 × 9 = 324/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Subtract the two like fractions:
324/630 - 294/630 = 324 - 294/630 = 30/630 - After reducing the fraction, the answer is 1/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/70-42/90 36/70-84/90