Add 72/84 and 3/40
72/84 + 3/40 is 261/280.
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,
72/84 = 72 × 10/84 × 10 = 720/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
3/40 = 3 × 21/40 × 21 = 63/840 - Add the two like fractions:
720/840 + 63/840 = 720 + 63/840 = 783/840 - 783/840 simplified gives 261/280
- So, 72/84 + 3/40 = 261/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84+6/40 72/84+3/80 72/84+9/40 72/84+15/40 72/84+21/40