Subtract 30/8 from 42/2
1st number: 21 0/2, 2nd number: 3 6/8
42/2 - 30/8 is 69/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 8 is 8
Next, find the equivalent fraction of both fractional numbers with denominator 8 - For the 1st fraction, since 2 × 4 = 8,
42/2 = 42 × 4/2 × 4 = 168/8 - Likewise, for the 2nd fraction, since 8 × 1 = 8,
30/8 = 30 × 1/8 × 1 = 30/8 - Subtract the two like fractions:
168/8 - 30/8 = 168 - 30/8 = 138/8 - After reducing the fraction, the answer is 69/4
- In mixed form: 171/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/2-30/8 42/2-60/8 42/4-30/8 42/2-30/16 42/2-90/8 42/6-30/8 42/2-30/24 42/10-30/8 42/2-30/40 42/14-30/8 42/2-30/56