Add 24/8 and 42/21
1st number: 3 0/8, 2nd number: 2 0/21
24/8 + 42/21 is 5/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
24/8 = 24 × 21/8 × 21 = 504/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
42/21 = 42 × 8/21 × 8 = 336/168 - Add the two like fractions:
504/168 + 336/168 = 504 + 336/168 = 840/168 - 840/168 simplified gives 5/1
- So, 24/8 + 42/21 = 5/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/8+42/21 24/8+84/21 24/16+42/21 72/8+42/21 24/8+42/63 24/40+42/21 24/56+42/21