Subtract 20/45 from 42/7
1st number: 6 0/7, 2nd number: 20/45
42/7 - 20/45 is 50/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 7 × 45 = 315,
42/7 = 42 × 45/7 × 45 = 1890/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
20/45 = 20 × 7/45 × 7 = 140/315 - Subtract the two like fractions:
1890/315 - 140/315 = 1890 - 140/315 = 1750/315 - After reducing the fraction, the answer is 50/9
- In mixed form: 55/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/7-20/45 42/7-40/45 42/14-20/45 42/7-20/90 42/7-60/45 42/21-20/45 42/35-20/45 42/49-20/45