Add 28/21 and 4/40
1st number: 1 7/21, 2nd number: 4/40
28/21 + 4/40 is 43/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
28/21 = 28 × 40/21 × 40 = 1120/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
4/40 = 4 × 21/40 × 21 = 84/840 - Add the two like fractions:
1120/840 + 84/840 = 1120 + 84/840 = 1204/840 - 1204/840 simplified gives 43/30
- So, 28/21 + 4/40 = 43/30
In mixed form: 113/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+4/40 28/21+8/40 28/42+4/40 28/21+4/80 84/21+4/40 28/21+12/40 28/63+4/40 28/21+20/40 28/21+28/40