Subtract 45/40 from 42/98
1st number: 42/98, 2nd number: 1 5/40
42/98 - 45/40 is -39/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 40 is 1960
Next, find the equivalent fraction of both fractional numbers with denominator 1960 - For the 1st fraction, since 98 × 20 = 1960,
42/98 = 42 × 20/98 × 20 = 840/1960 - Likewise, for the 2nd fraction, since 40 × 49 = 1960,
45/40 = 45 × 49/40 × 49 = 2205/1960 - Subtract the two like fractions:
840/1960 - 2205/1960 = 840 - 2205/1960 = -1365/1960 - After reducing the fraction, the answer is -39/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/98-45/40 42/98-90/40 42/98-45/80