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