Add 72/42 and 90/8
1st number: 1 30/42, 2nd number: 11 2/8
72/42 + 90/8 is 363/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
72/42 = 72 × 4/42 × 4 = 288/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
90/8 = 90 × 21/8 × 21 = 1890/168 - Add the two like fractions:
288/168 + 1890/168 = 288 + 1890/168 = 2178/168 - 2178/168 simplified gives 363/28
- So, 72/42 + 90/8 = 363/28
In mixed form: 1227/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84+90/8 72/42+90/16 72/42+90/24 72/42+90/40 72/42+90/56