Subtract 20/35 from 30/18
1st number: 1 12/18, 2nd number: 20/35
30/18 - 20/35 is 23/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 35 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
30/18 = 30 × 35/18 × 35 = 1050/630 - Likewise, for the 2nd fraction, since 35 × 18 = 630,
20/35 = 20 × 18/35 × 18 = 360/630 - Subtract the two like fractions:
1050/630 - 360/630 = 1050 - 360/630 = 690/630 - After reducing the fraction, the answer is 23/21
- In mixed form: 12/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18-20/35 30/18-40/35 30/36-20/35 30/18-20/70 90/18-20/35 30/18-60/35 30/54-20/35 30/90-20/35