Subtract 9/7 from 40/30
1st number: 1 10/30, 2nd number: 1 2/7
40/30 - 9/7 is 1/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
40/30 = 40 × 7/30 × 7 = 280/210 - Likewise, for the 2nd fraction, since 7 × 30 = 210,
9/7 = 9 × 30/7 × 30 = 270/210 - Subtract the two like fractions:
280/210 - 270/210 = 280 - 270/210 = 10/210 - 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: 80/30-9/7 40/30-18/7 40/60-9/7 40/30-9/14 40/30-27/7 40/90-9/7 40/30-9/21 40/30-45/7 40/30-9/35 40/30-63/7 40/30-9/49