Add 21/40 and 36/63
21/40 + 36/63 is 307/280.
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,
36/63 = 36 × 40/63 × 40 = 1440/2520 - Add the two like fractions:
1323/2520 + 1440/2520 = 1323 + 1440/2520 = 2763/2520 - 2763/2520 simplified gives 307/280
- So, 21/40 + 36/63 = 307/280
In mixed form: 127/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+36/63 21/40+72/63 21/80+36/63 63/40+36/63