Add 21/80 and 24/42
21/80 + 24/42 is 467/560.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
21/80 = 21 × 21/80 × 21 = 441/1680 - Likewise, for the 2nd fraction, since 42 × 40 = 1680,
24/42 = 24 × 40/42 × 40 = 960/1680 - Add the two like fractions:
441/1680 + 960/1680 = 441 + 960/1680 = 1401/1680 - 1401/1680 simplified gives 467/560
- So, 21/80 + 24/42 = 467/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+24/42 21/80+48/42 21/80+24/84 63/80+24/42 21/80+72/42