Subtract 63/45 from 20/42
1st number: 20/42, 2nd number: 1 18/45
20/42 - 63/45 is -97/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
20/42 = 20 × 15/42 × 15 = 300/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
63/45 = 63 × 14/45 × 14 = 882/630 - Subtract the two like fractions:
300/630 - 882/630 = 300 - 882/630 = -582/630 - After reducing the fraction, the answer is -97/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-63/45 20/84-63/45 20/42-63/90 60/42-63/45