Add 21/30 and 7/56
21/30 + 7/56 is 33/40.
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,
21/30 = 21 × 28/30 × 28 = 588/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
7/56 = 7 × 15/56 × 15 = 105/840 - Add the two like fractions:
588/840 + 105/840 = 588 + 105/840 = 693/840 - 693/840 simplified gives 33/40
- So, 21/30 + 7/56 = 33/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+7/56 21/30+14/56 21/60+7/56 63/30+7/56 21/30+21/56 21/90+7/56 21/30+35/56 21/30+49/56