Add 45/42 and 70/40
1st number: 1 3/42, 2nd number: 1 30/40
45/42 + 70/40 is 79/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
45/42 = 45 × 20/42 × 20 = 900/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
70/40 = 70 × 21/40 × 21 = 1470/840 - Add the two like fractions:
900/840 + 1470/840 = 900 + 1470/840 = 2370/840 - 2370/840 simplified gives 79/28
- So, 45/42 + 70/40 = 79/28
In mixed form: 223/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+70/40 45/84+70/40 45/42+70/80