Subtract 15/42 from 12/35
12/35 - 15/42 is -1/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 35 × 6 = 210,
12/35 = 12 × 6/35 × 6 = 72/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
15/42 = 15 × 5/42 × 5 = 75/210 - Subtract the two like fractions:
72/210 - 75/210 = 72 - 75/210 = -3/210 - After reducing the fraction, the answer is -1/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/35-15/42 12/35-30/42 12/70-15/42 12/35-15/84 36/35-15/42 12/35-45/42 60/35-15/42 12/35-75/42 84/35-15/42