Add 70/21 and 40/80
1st number: 3 7/21, 2nd number: 40/80
70/21 + 40/80 is 23/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
70/21 = 70 × 80/21 × 80 = 5600/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
40/80 = 40 × 21/80 × 21 = 840/1680 - Add the two like fractions:
5600/1680 + 840/1680 = 5600 + 840/1680 = 6440/1680 - 6440/1680 simplified gives 23/6
- So, 70/21 + 40/80 = 23/6
In mixed form: 35/6
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