Add 30/42 and 25/80
30/42 + 25/80 is 115/112.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
30/42 = 30 × 40/42 × 40 = 1200/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
25/80 = 25 × 21/80 × 21 = 525/1680 - Add the two like fractions:
1200/1680 + 525/1680 = 1200 + 525/1680 = 1725/1680 - 1725/1680 simplified gives 115/112
- So, 30/42 + 25/80 = 115/112
In mixed form: 13/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42+25/80 30/42+50/80 30/84+25/80 90/42+25/80 30/42+75/80