Add 28/5 and 40/21
1st number: 5 3/5, 2nd number: 1 19/21
28/5 + 40/21 is 788/105.
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,
28/5 = 28 × 21/5 × 21 = 588/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
40/21 = 40 × 5/21 × 5 = 200/105 - Add the two like fractions:
588/105 + 200/105 = 588 + 200/105 = 788/105 - So, 28/5 + 40/21 = 788/105
In mixed form: 753/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/5+40/21 28/5+80/21 28/10+40/21 28/5+40/42 84/5+40/21 28/15+40/21 28/5+40/63 28/25+40/21 28/35+40/21