Add 72/80 and 5/84
72/80 + 5/84 is 403/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 84 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 84 × 20 = 1680,
5/84 = 5 × 20/84 × 20 = 100/1680 - Add the two like fractions:
1512/1680 + 100/1680 = 1512 + 100/1680 = 1612/1680 - 1612/1680 simplified gives 403/420
- So, 72/80 + 5/84 = 403/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/80+10/84 72/80+15/84 72/80+25/84 72/80+35/84