Subtract 40/42 from 45/30
1st number: 1 15/30, 2nd number: 40/42
45/30 - 40/42 is 23/42.
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,
45/30 = 45 × 7/30 × 7 = 315/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
40/42 = 40 × 5/42 × 5 = 200/210 - Subtract the two like fractions:
315/210 - 200/210 = 315 - 200/210 = 115/210 - After reducing the fraction, the answer is 23/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30-40/42 45/30-80/42 45/60-40/42 45/30-40/84 45/90-40/42