Add 81/42 and 50/40
1st number: 1 39/42, 2nd number: 1 10/40
81/42 + 50/40 is 89/28.
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,
81/42 = 81 × 20/42 × 20 = 1620/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
50/40 = 50 × 21/40 × 21 = 1050/840 - Add the two like fractions:
1620/840 + 1050/840 = 1620 + 1050/840 = 2670/840 - 2670/840 simplified gives 89/28
- So, 81/42 + 50/40 = 89/28
In mixed form: 35/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84+50/40 81/42+50/80