Add 42/8 and 36/21
1st number: 5 2/8, 2nd number: 1 15/21
42/8 + 36/21 is 195/28.
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,
42/8 = 42 × 21/8 × 21 = 882/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
36/21 = 36 × 8/21 × 8 = 288/168 - Add the two like fractions:
882/168 + 288/168 = 882 + 288/168 = 1170/168 - 1170/168 simplified gives 195/28
- So, 42/8 + 36/21 = 195/28
In mixed form: 627/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8+36/21 42/8+72/21 42/16+36/21 42/8+36/42 42/24+36/21 42/8+36/63 42/40+36/21 42/56+36/21