Subtract 54/42 from 3/30
1st number: 3/30, 2nd number: 1 12/42
3/30 - 54/42 is -83/70.
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,
3/30 = 3 × 7/30 × 7 = 21/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
54/42 = 54 × 5/42 × 5 = 270/210 - Subtract the two like fractions:
21/210 - 270/210 = 21 - 270/210 = -249/210 - After reducing the fraction, the answer is -83/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/30-54/42 3/60-54/42 3/30-54/84 9/30-54/42 3/90-54/42 15/30-54/42 21/30-54/42