Add 28/40 and 1/42
28/40 + 1/42 is 76/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
28/40 = 28 × 21/40 × 21 = 588/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
1/42 = 1 × 20/42 × 20 = 20/840 - Add the two like fractions:
588/840 + 20/840 = 588 + 20/840 = 608/840 - 608/840 simplified gives 76/105
- So, 28/40 + 1/42 = 76/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40+1/42 28/40+2/42 28/80+1/42 28/40+1/84 84/40+1/42 28/40+3/42 28/40+5/42 28/40+7/42