math

posted by .

Express 13/10 - 2/15 as a simplified rational number. I want to make sure I'm doing it correctly. 10 and 15 will go in there 30T and then I said 15 will go in 30 4 T and did I said 10 will go in 30 3T which gave me 35/30 and did I divided it and got 1.16667 do you understand what I just explained.


Not entirely, but I think it's equivalent to this.
What you have are two fractions, so you need to determine a common denominator.
The 2 denominators are 10 and 15. I think you can see that the LCM is 30. If not, run through the multiples of 15 that end with 0.
Thus our expression is equivalent to
(3*13)/(3*10) -(2*2)/(2*15) or,
39/30 - 4/30 = (39-4)/30
You should be able to simplify this. I see that you did get this result. If we divide the top and bottom by 5 we get 7/6, which is approx. equivalent to the decimal you gave.
Do you understand what I just explained?


I'm kinda confuse now well I understand how I got the LCM but once I did that I thought you suppose to times it and then subtract 39 - 4 which is 35/30 then I divided it and I got 1.166667 I don't understand why we're dividing it by 5 can you please explain again for me if you don't mine. Thanks for your help


Yes, we ended up with the fraction 35/30.
The numerator and denominator have a common factor of 5, i.e. (7*5)/(6*5). This is what I meant by dividing the top and bottom by 5.
We simplify the fraction by cancelling the common factors in the numerator and denominator to get 7/6.
This is equivalent to the decimal you got. 7/6 = 1 1/6 ia approx 1.166667.
Does that clarify?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math(dispute to previous question)

    2)Name the sets of numbers to which 457 belongs. (answer)natural,whole,integers,rational,reals My book says that every REAL number has to be rational or irrational. Blueridge said that my answer was correct except to exclude rational …
  2. Algebra

    Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. You reached 1 for an answer, didn’t you?
  3. Grammar

    Select the correctly punctuated sentence: A) He said, "There but for the grace of God go I." B) He said "There but for the grace of God go I." C) He said, "There but for the grace of God go I". D) He said "There but for the grace of …
  4. English

    Identify the sentence that is punctuated correctly. A. He whispered, "I love you," and then fainted. B. "Your idea is excellent" said Matt, "but I'm not sure we have the budget to implement it." C. "I don't believe it!" exclaimed, …
  5. English

    Identify the sentence that is punctuated correctly. A. He whispered, "I love you," and then fainted. B. "Your idea is excellent" said Matt, "but I'm not sure we have the budget to implement it." C. "I don't believe it!" exclaimed, …
  6. English

    1. Make sure you go to bed early. 2. Make sure you play ping-pong with him. 3. Make sure you talk with the person. 4. Make sure you go back home early. 5. Make sure you call your mother. 6. Make sure you send the money to him. 7. Make …
  7. ms.sue math

    Which sum will be irrational? a. 3 + 2 b. √19 + 7/2 ****** c. 18/3 + 11/10000 d. –6 + (–3.251) Which product will be rational?
  8. Math -real numbers

    Which statement is false? A) the number zero is a rational number. B)some irrational numbers are also rational numbers. C)Every irrational number is a real number. D) every integer is a rational number These questions get me every
  9. Math-Measure's & area

    1. Find the area of a parallelogram with base b and height h. B=82cm H=16.6cm a.**1,361.2 cm^2 b.6,724 cm^2 c.137.78 cm^2 d.98.6 cm^2 2.Identify all the sets to which the number belongs. Choose from rational number, irrational number, …
  10. Math

    Express 0.54 as a rational number.

More Similar Questions