## anonymous 3 years ago Need helpp MEdalls!!!

1. anonymous

Okay, if you say so.

2. anonymous

hang on imma draw my problem

3. anonymous

Lol

4. anonymous

$-4\frac{ 3 }{ 5 }-2\frac{ 1 }{ 2 }$

5. anonymous

I dont understad how to simplify these problems

6. anonymous

Id rather know how to do this problem then relie on a caculator

7. anonymous

dude uve been typing for the past 20 minutes are you gonna help me?

8. anonymous

-71/10

9. anonymous

changed mixed numbers to improper fractions

10. anonymous

so -(23/5)-(5/2)=-(46/10)-(25/10)=-71/10

11. anonymous

but I have like 20 more of those to answer so I was hopeing somebody can show me the steps so I can copy the procedure on the other problems

12. anonymous

ok multiply 5 by 4 and then add 3 for first fraction to get -23/5

13. anonymous

the quickest way to think about it is to multiply the denominator by the whole number the add the numerator. the get common denominators before anyting else

14. anonymous

you get the numerator that way over the same denominator

15. anonymous

so like x(a/b) = (bx+a)/b

16. anonymous

do same for second fraction to end up with improper fractions

17. anonymous

so I have to find the common denominator before anythiing

18. anonymous

i would get them to imporper fractions before common denominators

19. anonymous

yes then find common denominator if it is not already there.

20. anonymous

first. convert mixed number to improper fraction second. get common denominator if needed third. solve

21. anonymous

okay so it should be 12/5 -2/2

22. anonymous

then the denominators should be 10 right

23. anonymous

no $4 \frac{ 3 }{ 5 }$

24. anonymous

becomes 23/5

25. anonymous

how did you get 23

26. anonymous

because 5*4 is 20 and then add 3 to get 23

27. anonymous

that is new numerator

28. anonymous

and denominator stays the same

29. anonymous

oh okay so let me try again

30. anonymous

23/5 - 5/2

31. anonymous
32. anonymous

yes thats right but dont forget the minus signs

33. anonymous

okay the 23/5 would be negative right ?

34. anonymous

yes

35. anonymous

because 4(3/5) was negative

36. anonymous

the number is the same just converted to make it easier to do computations

37. anonymous

type in calculator and see you get the same number

38. anonymous

-(23/5) -5/2 and the common denominator would be ten right

39. anonymous

also 5 goes into 23 4 times plus some remainder which is the fraction

40. anonymous

yes

41. anonymous

okay i got that

42. anonymous

so were do i go from there

43. anonymous

just subtract the numerators and get the solution

44. anonymous

18/10

45. anonymous

the denominator stays the same so -71/10

46. anonymous

how did you get 71

47. anonymous

when you multiplied to get common denominator what did you get?

48. anonymous

-46/10-25/10=-71/10

49. anonymous

I did'nt multipy anything

50. anonymous

do u see how I got that

51. anonymous

you cross multiplyed?

52. anonymous

multiply top and bottom for -23/5 by 10 and then multiply top and bottom of 25/10 by 2 to get 46/10 and 25/10

53. anonymous

oh sorry I wrote that wrong ignore it

54. anonymous

so -23/5 by 2/2 and -5/2 by 5/5

55. anonymous

okay I see

56. anonymous

so -71/10

57. anonymous

do you get it?

58. anonymous

yea

59. anonymous

-71/10 right and that can be simplified

60. anonymous

take a look at this http://www.mathsisfun.com/numbers/common-denominator.html

61. anonymous

yes correct!

62. anonymous

cool thanks man

63. anonymous

no problem take care

64. anonymous

you too

65. anonymous

do you see what i mean

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