Add 70/21 and 10/40
1st number: 3 7/21, 2nd number: 10/40
70/21 + 10/40 is 43/12.
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,
70/21 = 70 × 40/21 × 40 = 2800/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
10/40 = 10 × 21/40 × 21 = 210/840 - Add the two like fractions:
2800/840 + 210/840 = 2800 + 210/840 = 3010/840 - 3010/840 simplified gives 43/12
- So, 70/21 + 10/40 = 43/12
In mixed form: 37/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+20/40 70/42+10/40 70/21+10/80 70/21+30/40 70/63+10/40 70/21+50/40 70/21+70/40