Subtract 4/21 from 6/45
6/45 - 4/21 is -2/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
6/45 = 6 × 7/45 × 7 = 42/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
4/21 = 4 × 15/21 × 15 = 60/315 - Subtract the two like fractions:
42/315 - 60/315 = 42 - 60/315 = -18/315 - After reducing the fraction, the answer is -2/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/45-4/21 6/45-8/21 6/90-4/21 6/45-4/42 18/45-4/21 6/45-12/21 6/45-4/63 30/45-4/21 6/45-20/21 42/45-4/21 6/45-28/21