Add 54/5 and 30/21
1st number: 10 4/5, 2nd number: 1 9/21
54/5 + 30/21 is 428/35.
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,
54/5 = 54 × 21/5 × 21 = 1134/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
30/21 = 30 × 5/21 × 5 = 150/105 - Add the two like fractions:
1134/105 + 150/105 = 1134 + 150/105 = 1284/105 - 1284/105 simplified gives 428/35
- So, 54/5 + 30/21 = 428/35
In mixed form: 128/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/5+60/21 54/10+30/21 54/5+30/42 54/5+90/21 54/15+30/21 54/5+30/63 54/25+30/21 54/35+30/21