Add 21/24 and 40/70
21/24 + 40/70 is 81/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 70 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 24 × 35 = 840,
21/24 = 21 × 35/24 × 35 = 735/840 - Likewise, for the 2nd fraction, since 70 × 12 = 840,
40/70 = 40 × 12/70 × 12 = 480/840 - Add the two like fractions:
735/840 + 480/840 = 735 + 480/840 = 1215/840 - 1215/840 simplified gives 81/56
- So, 21/24 + 40/70 = 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: 42/24+40/70 21/24+80/70 21/48+40/70 63/24+40/70 21/72+40/70