Add 3/21 and 84/40
1st number: 3/21, 2nd number: 2 4/40
3/21 + 84/40 is 157/70.
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,
3/21 = 3 × 40/21 × 40 = 120/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
84/40 = 84 × 21/40 × 21 = 1764/840 - Add the two like fractions:
120/840 + 1764/840 = 120 + 1764/840 = 1884/840 - 1884/840 simplified gives 157/70
- So, 3/21 + 84/40 = 157/70
In mixed form: 217/70
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