Add 3/21 and 40/63
3/21 + 40/63 is 7/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
3/21 = 3 × 3/21 × 3 = 9/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
40/63 = 40 × 1/63 × 1 = 40/63 - Add the two like fractions:
9/63 + 40/63 = 9 + 40/63 = 49/63 - 49/63 simplified gives 7/9
- So, 3/21 + 40/63 = 7/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+40/63 3/21+80/63 3/42+40/63 9/21+40/63 3/63+40/63 15/21+40/63