Add 40/80 and 30/84
40/80 + 30/84 is 6/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 84 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
40/80 = 40 × 21/80 × 21 = 840/1680 - Likewise, for the 2nd fraction, since 84 × 20 = 1680,
30/84 = 30 × 20/84 × 20 = 600/1680 - Add the two like fractions:
840/1680 + 600/1680 = 840 + 600/1680 = 1440/1680 - 1440/1680 simplified gives 6/7
- So, 40/80 + 30/84 = 6/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80+60/84 40/80+90/84