Add 40/21 and 84/40
1st number: 1 19/21, 2nd number: 2 4/40
40/21 + 84/40 is 841/210.
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,
40/21 = 40 × 40/21 × 40 = 1600/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
84/40 = 84 × 21/40 × 21 = 1764/840 - Add the two like fractions:
1600/840 + 1764/840 = 1600 + 1764/840 = 3364/840 - 3364/840 simplified gives 841/210
- So, 40/21 + 84/40 = 841/210
In mixed form: 41/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+84/40 40/42+84/40 40/21+84/80 40/63+84/40