Subtract 42/45 from 20/8
1st number: 2 4/8, 2nd number: 42/45
20/8 - 42/45 is 47/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 45 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 8 × 45 = 360,
20/8 = 20 × 45/8 × 45 = 900/360 - Likewise, for the 2nd fraction, since 45 × 8 = 360,
42/45 = 42 × 8/45 × 8 = 336/360 - Subtract the two like fractions:
900/360 - 336/360 = 900 - 336/360 = 564/360 - After reducing the fraction, the answer is 47/30
- In mixed form: 117/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/8-42/45 20/8-84/45 20/16-42/45 20/8-42/90 60/8-42/45 20/24-42/45 20/40-42/45 20/56-42/45