Add 27/40 and 21/63
27/40 + 21/63 is 121/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 63 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 40 × 63 = 2520,
27/40 = 27 × 63/40 × 63 = 1701/2520 - Likewise, for the 2nd fraction, since 63 × 40 = 2520,
21/63 = 21 × 40/63 × 40 = 840/2520 - Add the two like fractions:
1701/2520 + 840/2520 = 1701 + 840/2520 = 2541/2520 - 2541/2520 simplified gives 121/120
- So, 27/40 + 21/63 = 121/120
In mixed form: 11/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/40+21/63 27/40+42/63 27/80+21/63 81/40+21/63