Add 40/63 and 45/21
1st number: 40/63, 2nd number: 2 3/21
40/63 + 45/21 is 25/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
40/63 = 40 × 1/63 × 1 = 40/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
45/21 = 45 × 3/21 × 3 = 135/63 - Add the two like fractions:
40/63 + 135/63 = 40 + 135/63 = 175/63 - 175/63 simplified gives 25/9
- So, 40/63 + 45/21 = 25/9
In mixed form: 27/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/63+45/21 40/63+90/21 40/63+45/42 40/63+45/63