Add 24/21 and 42/40
1st number: 1 3/21, 2nd number: 1 2/40
24/21 + 42/40 is 307/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
24/21 = 24 × 40/21 × 40 = 960/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
42/40 = 42 × 21/40 × 21 = 882/840 - Add the two like fractions:
960/840 + 882/840 = 960 + 882/840 = 1842/840 - 1842/840 simplified gives 307/140
- So, 24/21 + 42/40 = 307/140
In mixed form: 227/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/21+42/40 24/21+84/40 24/42+42/40 24/21+42/80 72/21+42/40 24/63+42/40