Add 15/30 and 42/56
15/30 + 42/56 is 5/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 56 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 30 × 28 = 840,
15/30 = 15 × 28/30 × 28 = 420/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
42/56 = 42 × 15/56 × 15 = 630/840 - Add the two like fractions:
420/840 + 630/840 = 420 + 630/840 = 1050/840 - 1050/840 simplified gives 5/4
- So, 15/30 + 42/56 = 5/4
In mixed form: 11/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 15/30+84/56 15/60+42/56 45/30+42/56 15/90+42/56 75/30+42/56