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## mtmb11 2 years ago What is the sum of 7/2 + -3/5

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1. mtmb11

there is no 2.9

2. LogicalApple

29/10?

3. mtmb11

ya thats there

4. mtmb11

thank you

5. LogicalApple

2.9 = 29/10. One is just written as a decimal. Do you understand how to arrive at 29/10?

6. mtmb11

nope

7. LogicalApple

Consider the denominators in your original problem. How could we arrive at a common denominator?

8. mtmb11

what do u mean

9. LogicalApple

When we have fractions with different denominators, we cannot add or subtract straightforwardly. We first have to convert each to a common denominator. For example, if we had 1/3 + 1/4 we would convert both fractions such that each had a denominator of 12 1/3 = 4/12 1/4 = 3/12 1/3 + 1/4 = 4/12 + 3/12 = 7/12 Another way of asking the question is: what is a common multiple of 3 and 4? In this case, 12 is. So we convert each fraction so it has a denominator of 12, then add them. The same reasoning is true for your problem. What is a common multiple of 2 and 5?

10. mtmb11

o ok thank u i get it now

11. LogicalApple

Ok! Best of luck with your studies.

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