Add 42/28 and 15/40
1st number: 1 14/28, 2nd number: 15/40
42/28 + 15/40 is 15/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 28 × 10 = 280,
42/28 = 42 × 10/28 × 10 = 420/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
15/40 = 15 × 7/40 × 7 = 105/280 - Add the two like fractions:
420/280 + 105/280 = 420 + 105/280 = 525/280 - 525/280 simplified gives 15/8
- So, 42/28 + 15/40 = 15/8
In mixed form: 17/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/28+15/40 42/28+30/40 42/56+15/40 42/28+15/80 42/28+45/40 42/84+15/40 42/28+75/40