Add 21/45 and 6/21
21/45 + 6/21 is 79/105.
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,
21/45 = 21 × 7/45 × 7 = 147/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
6/21 = 6 × 15/21 × 15 = 90/315 - Add the two like fractions:
147/315 + 90/315 = 147 + 90/315 = 237/315 - 237/315 simplified gives 79/105
- So, 21/45 + 6/21 = 79/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+6/21 21/45+12/21 21/90+6/21 21/45+6/42 63/45+6/21 21/45+18/21 21/45+6/63 21/45+30/21 21/45+42/21