Subtract 40/42 from 1/30
1/30 - 40/42 is -193/210.
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,
1/30 = 1 × 7/30 × 7 = 7/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
40/42 = 40 × 5/42 × 5 = 200/210 - Subtract the two like fractions:
7/210 - 200/210 = 7 - 200/210 = -193/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/30-40/42 1/30-80/42 1/60-40/42 1/30-40/84 3/30-40/42 1/90-40/42 5/30-40/42 7/30-40/42