Subtract 60/21 from 42/30
1st number: 1 12/30, 2nd number: 2 18/21
42/30 - 60/21 is -51/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
60/21 = 60 × 10/21 × 10 = 600/210 - Subtract the two like fractions:
294/210 - 600/210 = 294 - 600/210 = -306/210 - After reducing the fraction, the answer is -51/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-60/21 42/60-60/21 42/30-60/42 42/90-60/21 42/30-60/63