Subtract 15/42 from 12/30
12/30 - 15/42 is 3/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
12/30 = 12 × 7/30 × 7 = 84/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
15/42 = 15 × 5/42 × 5 = 75/210 - Subtract the two like fractions:
84/210 - 75/210 = 84 - 75/210 = 9/210 - After reducing the fraction, the answer is 3/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/30-15/42 12/30-30/42 12/60-15/42 12/30-15/84 36/30-15/42 12/30-45/42 12/90-15/42 60/30-15/42 12/30-75/42 84/30-15/42