Add 21/30 and 12/56
21/30 + 12/56 is 32/35.
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,
12/56 = 12 × 15/56 × 15 = 180/840 - Add the two like fractions:
588/840 + 180/840 = 588 + 180/840 = 768/840 - 768/840 simplified gives 32/35
- So, 21/30 + 12/56 = 32/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+12/56 21/30+24/56 21/60+12/56 63/30+12/56 21/30+36/56 21/90+12/56 21/30+60/56 21/30+84/56