Add 21/40 and 56/63
21/40 + 56/63 is 509/360.
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,
21/40 = 21 × 63/40 × 63 = 1323/2520 - Likewise, for the 2nd fraction, since 63 × 40 = 2520,
56/63 = 56 × 40/63 × 40 = 2240/2520 - Add the two like fractions:
1323/2520 + 2240/2520 = 1323 + 2240/2520 = 3563/2520 - 3563/2520 simplified gives 509/360
- So, 21/40 + 56/63 = 509/360
In mixed form: 1149/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+56/63 21/80+56/63 63/40+56/63