Add 30/70 and 21/56
30/70 + 21/56 is 45/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
30/70 = 30 × 4/70 × 4 = 120/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Add the two like fractions:
120/280 + 105/280 = 120 + 105/280 = 225/280 - 225/280 simplified gives 45/56
- So, 30/70 + 21/56 = 45/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+21/56 30/70+42/56 90/70+21/56 30/70+63/56