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mtmb11

  • 2 years ago

What is the sum of 7/2 + -3/5

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  1. mtmb11
    • 2 years ago
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    there is no 2.9

  2. LogicalApple
    • 2 years ago
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    29/10?

  3. mtmb11
    • 2 years ago
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    ya thats there

  4. mtmb11
    • 2 years ago
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    thank you

  5. LogicalApple
    • 2 years ago
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    2.9 = 29/10. One is just written as a decimal. Do you understand how to arrive at 29/10?

  6. mtmb11
    • 2 years ago
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    nope

  7. LogicalApple
    • 2 years ago
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    Consider the denominators in your original problem. How could we arrive at a common denominator?

  8. mtmb11
    • 2 years ago
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    what do u mean

  9. LogicalApple
    • 2 years ago
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    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
    • 2 years ago
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    o ok thank u i get it now

  11. LogicalApple
    • 2 years ago
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    Ok! Best of luck with your studies.

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