Add 21/49 and 15/80
21/49 + 15/80 is 69/112.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 80 is 3920
Next, find the equivalent fraction of both fractional numbers with denominator 3920 - For the 1st fraction, since 49 × 80 = 3920,
21/49 = 21 × 80/49 × 80 = 1680/3920 - Likewise, for the 2nd fraction, since 80 × 49 = 3920,
15/80 = 15 × 49/80 × 49 = 735/3920 - Add the two like fractions:
1680/3920 + 735/3920 = 1680 + 735/3920 = 2415/3920 - 2415/3920 simplified gives 69/112
- So, 21/49 + 15/80 = 69/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/49+15/80 21/49+30/80 21/98+15/80 63/49+15/80 21/49+45/80 21/49+75/80