Add 21/45 and 63/7
1st number: 21/45, 2nd number: 9 0/7
21/45 + 63/7 is 142/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 7 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
21/45 = 21 × 7/45 × 7 = 147/315 - Likewise, for the 2nd fraction, since 7 × 45 = 315,
63/7 = 63 × 45/7 × 45 = 2835/315 - Add the two like fractions:
147/315 + 2835/315 = 147 + 2835/315 = 2982/315 - 2982/315 simplified gives 142/15
- So, 21/45 + 63/7 = 142/15
In mixed form: 97/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+63/7 21/90+63/7 21/45+63/14 63/45+63/7 21/45+63/21 21/45+63/35 21/45+63/49