Subtract 3/30 from 4/42
4/42 - 3/30 is -1/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
4/42 = 4 × 5/42 × 5 = 20/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
3/30 = 3 × 7/30 × 7 = 21/210 - Subtract the two like fractions:
20/210 - 21/210 = 20 - 21/210 = -1/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42-3/30 4/42-6/30 4/84-3/30 4/42-3/60 12/42-3/30 4/42-9/30 4/42-3/90 20/42-3/30 4/42-15/30 28/42-3/30 4/42-21/30