Add 72/80 and 2/21
72/80 + 2/21 is 209/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 21 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
72/80 = 72 × 21/80 × 21 = 1512/1680 - Likewise, for the 2nd fraction, since 21 × 80 = 1680,
2/21 = 2 × 80/21 × 80 = 160/1680 - Add the two like fractions:
1512/1680 + 160/1680 = 1512 + 160/1680 = 1672/1680 - 1672/1680 simplified gives 209/210
- So, 72/80 + 2/21 = 209/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/80+4/21 72/80+2/42 72/80+6/21 72/80+2/63 72/80+10/21 72/80+14/21