Add 4/45 and 63/21
1st number: 4/45, 2nd number: 3 0/21
4/45 + 63/21 is 139/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
4/45 = 4 × 7/45 × 7 = 28/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
63/21 = 63 × 15/21 × 15 = 945/315 - Add the two like fractions:
28/315 + 945/315 = 28 + 945/315 = 973/315 - 973/315 simplified gives 139/45
- So, 4/45 + 63/21 = 139/45
In mixed form: 34/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/45+63/21 4/90+63/21 4/45+63/42 12/45+63/21 20/45+63/21 28/45+63/21