Add 84/40 and 15/42
1st number: 2 4/40, 2nd number: 15/42
84/40 + 15/42 is 86/35.
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,
84/40 = 84 × 21/40 × 21 = 1764/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
15/42 = 15 × 20/42 × 20 = 300/840 - Add the two like fractions:
1764/840 + 300/840 = 1764 + 300/840 = 2064/840 - 2064/840 simplified gives 86/35
- So, 84/40 + 15/42 = 86/35
In mixed form: 216/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40+30/42 84/80+15/42 84/40+15/84 84/40+45/42 84/40+75/42