Add 40/70 and 21/24
40/70 + 21/24 is 81/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 24 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 70 × 12 = 840,
40/70 = 40 × 12/70 × 12 = 480/840 - Likewise, for the 2nd fraction, since 24 × 35 = 840,
21/24 = 21 × 35/24 × 35 = 735/840 - Add the two like fractions:
480/840 + 735/840 = 480 + 735/840 = 1215/840 - 1215/840 simplified gives 81/56
- So, 40/70 + 21/24 = 81/56
In mixed form: 125/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/70+21/24 40/70+42/24 40/70+21/48 40/70+63/24 40/70+21/72