Add 72/21 and 1/8
1st number: 3 9/21, 2nd number: 1/8
72/21 + 1/8 is 199/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
72/21 = 72 × 8/21 × 8 = 576/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
1/8 = 1 × 21/8 × 21 = 21/168 - Add the two like fractions:
576/168 + 21/168 = 576 + 21/168 = 597/168 - 597/168 simplified gives 199/56
- So, 72/21 + 1/8 = 199/56
In mixed form: 331/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+2/8 72/42+1/8 72/21+1/16 72/21+3/8 72/63+1/8 72/21+1/24 72/21+5/8 72/21+1/40 72/21+7/8 72/21+1/56