Add 15/8 and 75/21
1st number: 1 7/8, 2nd number: 3 12/21
15/8 + 75/21 is 305/56.
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,
15/8 = 15 × 21/8 × 21 = 315/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
75/21 = 75 × 8/21 × 8 = 600/168 - Add the two like fractions:
315/168 + 600/168 = 315 + 600/168 = 915/168 - 915/168 simplified gives 305/56
- So, 15/8 + 75/21 = 305/56
In mixed form: 525/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/8+75/21 15/16+75/21 15/8+75/42 45/8+75/21 15/24+75/21 15/8+75/63 75/8+75/21 15/40+75/21 15/56+75/21