Add 21/84 and 54/80
21/84 + 54/80 is 37/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 84 × 20 = 1680,
21/84 = 21 × 20/84 × 20 = 420/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
54/80 = 54 × 21/80 × 21 = 1134/1680 - Add the two like fractions:
420/1680 + 1134/1680 = 420 + 1134/1680 = 1554/1680 - 1554/1680 simplified gives 37/40
- So, 21/84 + 54/80 = 37/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+54/80 63/84+54/80