Subtract 18/40 from 4/30
4/30 - 18/40 is -19/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
4/30 = 4 × 4/30 × 4 = 16/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
18/40 = 18 × 3/40 × 3 = 54/120 - Subtract the two like fractions:
16/120 - 54/120 = 16 - 54/120 = -38/120 - After reducing the fraction, the answer is -19/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/30-18/40 4/30-36/40 4/60-18/40 4/30-18/80 12/30-18/40 4/30-54/40 4/90-18/40 20/30-18/40 4/30-90/40 28/30-18/40