Add 10/40 and 21/28
10/40 + 21/28 is 1/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 28 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
10/40 = 10 × 7/40 × 7 = 70/280 - Likewise, for the 2nd fraction, since 28 × 10 = 280,
21/28 = 21 × 10/28 × 10 = 210/280 - Add the two like fractions:
70/280 + 210/280 = 70 + 210/280 = 280/280 - 280/280 simplified gives 1/1
- So, 10/40 + 21/28 = 1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40+21/28 10/40+42/28 10/80+21/28 10/40+21/56 30/40+21/28 10/40+63/28 10/40+21/84 50/40+21/28 70/40+21/28