Add 10/40 and 70/42
1st number: 10/40, 2nd number: 1 28/42
10/40 + 70/42 is 23/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
10/40 = 10 × 21/40 × 21 = 210/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
70/42 = 70 × 20/42 × 20 = 1400/840 - Add the two like fractions:
210/840 + 1400/840 = 210 + 1400/840 = 1610/840 - 1610/840 simplified gives 23/12
- So, 10/40 + 70/42 = 23/12
In mixed form: 111/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40+70/42 10/80+70/42 10/40+70/84 30/40+70/42 50/40+70/42 70/40+70/42