Add 28/42 and 25/40
28/42 + 25/40 is 31/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
28/42 = 28 × 20/42 × 20 = 560/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
25/40 = 25 × 21/40 × 21 = 525/840 - Add the two like fractions:
560/840 + 525/840 = 560 + 525/840 = 1085/840 - 1085/840 simplified gives 31/24
- So, 28/42 + 25/40 = 31/24
In mixed form: 17/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42+25/40 28/42+50/40 28/84+25/40 28/42+25/80 84/42+25/40 28/42+75/40