Add 28/84 and 10/40
28/84 + 10/40 is 7/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 84 × 10 = 840,
28/84 = 28 × 10/84 × 10 = 280/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
10/40 = 10 × 21/40 × 21 = 210/840 - Add the two like fractions:
280/840 + 210/840 = 280 + 210/840 = 490/840 - 490/840 simplified gives 7/12
- So, 28/84 + 10/40 = 7/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/84+10/40 28/84+20/40 28/84+10/80 28/84+30/40 28/84+50/40 28/84+70/40