Add 21/45 and 5/84
21/45 + 5/84 is 221/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 84 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 45 × 28 = 1260,
21/45 = 21 × 28/45 × 28 = 588/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
5/84 = 5 × 15/84 × 15 = 75/1260 - Add the two like fractions:
588/1260 + 75/1260 = 588 + 75/1260 = 663/1260 - 663/1260 simplified gives 221/420
- So, 21/45 + 5/84 = 221/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+5/84 21/45+10/84 21/90+5/84 63/45+5/84 21/45+15/84 21/45+25/84 21/45+35/84