Add 21/56 and 70/40
1st number: 21/56, 2nd number: 1 30/40
21/56 + 70/40 is 17/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
70/40 = 70 × 7/40 × 7 = 490/280 - Add the two like fractions:
105/280 + 490/280 = 105 + 490/280 = 595/280 - 595/280 simplified gives 17/8
- So, 21/56 + 70/40 = 17/8
In mixed form: 21/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56+70/40 21/56+70/80 63/56+70/40