Add 21/70 and 27/80
21/70 + 27/80 is 51/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
21/70 = 21 × 8/70 × 8 = 168/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
27/80 = 27 × 7/80 × 7 = 189/560 - Add the two like fractions:
168/560 + 189/560 = 168 + 189/560 = 357/560 - 357/560 simplified gives 51/80
- So, 21/70 + 27/80 = 51/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+27/80 21/70+54/80 63/70+27/80 21/70+81/80