Add 15/60 and 42/80
15/60 + 42/80 is 31/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 60 × 4 = 240,
15/60 = 15 × 4/60 × 4 = 60/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
42/80 = 42 × 3/80 × 3 = 126/240 - Add the two like fractions:
60/240 + 126/240 = 60 + 126/240 = 186/240 - 186/240 simplified gives 31/40
- So, 15/60 + 42/80 = 31/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/60+42/80 15/60+84/80 45/60+42/80 75/60+42/80