Add 8/40 and 45/42
1st number: 8/40, 2nd number: 1 3/42
8/40 + 45/42 is 89/70.
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,
8/40 = 8 × 21/40 × 21 = 168/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
45/42 = 45 × 20/42 × 20 = 900/840 - Add the two like fractions:
168/840 + 900/840 = 168 + 900/840 = 1068/840 - 1068/840 simplified gives 89/70
- So, 8/40 + 45/42 = 89/70
In mixed form: 119/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/40+45/42 8/40+90/42 8/80+45/42 8/40+45/84 24/40+45/42 56/40+45/42