Add 75/5 and 28/21
1st number: 15 0/5, 2nd number: 1 7/21
75/5 + 28/21 is 49/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
75/5 = 75 × 21/5 × 21 = 1575/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
28/21 = 28 × 5/21 × 5 = 140/105 - Add the two like fractions:
1575/105 + 140/105 = 1575 + 140/105 = 1715/105 - 1715/105 simplified gives 49/3
- So, 75/5 + 28/21 = 49/3
In mixed form: 161/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/5+56/21 75/10+28/21 75/5+28/42 75/5+84/21 75/15+28/21 75/5+28/63 75/25+28/21 75/35+28/21