Subtract 8/30 from 42/72
42/72 - 8/30 is 19/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 30 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
42/72 = 42 × 5/72 × 5 = 210/360 - Likewise, for the 2nd fraction, since 30 × 12 = 360,
8/30 = 8 × 12/30 × 12 = 96/360 - Subtract the two like fractions:
210/360 - 96/360 = 210 - 96/360 = 114/360 - After reducing the fraction, the answer is 19/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/72-8/30 42/72-16/30 42/72-8/60 42/72-24/30 42/72-8/90 42/72-40/30 42/72-56/30