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3 1/2 + 2 1/3

 Feb 6, 2015

Best Answer 

 #1
avatar+1006 
+5

$${\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{2}}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}$$

 

Think of the fractions as added onto the whole numbers. Take the equation and add the whole numbers together. Separate the fractions.

 

$$\left({\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}\right){\mathtt{\,\small\textbf+\,}}\left({\frac{{\mathtt{1}}}{{\mathtt{2}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}\right)$$

 

3+2 is 5, but what about 1/2 + 1/3? To add fractions, find the LCM, or Least Common Multiple.

 

2: 2, 4, 6, 8, 10...

3: 3, 6, 9, 12, 15...

 

The first number where these two have the same factor is 6, so, in order to add these numbers together, make the denominators of both 6. For 1/2, we pultiply the top and the bottom by 3, and for 1/3 we multiply both by 2.

 

(1*3)/(2*3) = 3/6

(1*2)/(3*2) = 2/6

 

Now, since they have a common denominator, add the numerators together:

 

$${\frac{{\mathtt{3}}}{{\mathtt{6}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{2}}}{{\mathtt{6}}}} = {\frac{{\mathtt{5}}}{{\mathtt{6}}}} = {\mathtt{0.833\: \!333\: \!333\: \!333\: \!333\: \!3}}$$

 

Final answer: 5 5/6

 

(Another method of finding the LCM is to multiply the two numerators: In this case, multiplying 2 and 3:

 

$${\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{3}} = {\mathtt{6}}$$

 

In the end, the answer is still 6.

 

From there, you can then multiply one factor's denominator by the other's and vice versa. After that, proceed as normal.)

 Feb 6, 2015
 #1
avatar+1006 
+5
Best Answer

$${\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{2}}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}$$

 

Think of the fractions as added onto the whole numbers. Take the equation and add the whole numbers together. Separate the fractions.

 

$$\left({\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}\right){\mathtt{\,\small\textbf+\,}}\left({\frac{{\mathtt{1}}}{{\mathtt{2}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}\right)$$

 

3+2 is 5, but what about 1/2 + 1/3? To add fractions, find the LCM, or Least Common Multiple.

 

2: 2, 4, 6, 8, 10...

3: 3, 6, 9, 12, 15...

 

The first number where these two have the same factor is 6, so, in order to add these numbers together, make the denominators of both 6. For 1/2, we pultiply the top and the bottom by 3, and for 1/3 we multiply both by 2.

 

(1*3)/(2*3) = 3/6

(1*2)/(3*2) = 2/6

 

Now, since they have a common denominator, add the numerators together:

 

$${\frac{{\mathtt{3}}}{{\mathtt{6}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{2}}}{{\mathtt{6}}}} = {\frac{{\mathtt{5}}}{{\mathtt{6}}}} = {\mathtt{0.833\: \!333\: \!333\: \!333\: \!333\: \!3}}$$

 

Final answer: 5 5/6

 

(Another method of finding the LCM is to multiply the two numerators: In this case, multiplying 2 and 3:

 

$${\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{3}} = {\mathtt{6}}$$

 

In the end, the answer is still 6.

 

From there, you can then multiply one factor's denominator by the other's and vice versa. After that, proceed as normal.)

GoldenLeaf Feb 6, 2015

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