twitch 2 years ago Need helpp MEdalls!!!

1. TrashMan914

Okay, if you say so.

2. twitch

hang on imma draw my problem

3. evansda

Lol

4. twitch

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

5. twitch

I dont understad how to simplify these problems

6. twitch

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

7. twitch

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

8. akhaliq99

-71/10

9. akhaliq99

changed mixed numbers to improper fractions

10. akhaliq99

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

11. twitch

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. akhaliq99

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

13. Benbburn

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. akhaliq99

you get the numerator that way over the same denominator

15. Benbburn

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

16. akhaliq99

do same for second fraction to end up with improper fractions

17. twitch

so I have to find the common denominator before anythiing

18. Benbburn

i would get them to imporper fractions before common denominators

19. akhaliq99

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

20. akhaliq99

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

21. twitch

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

22. twitch

then the denominators should be 10 right

23. akhaliq99

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

24. akhaliq99

becomes 23/5

25. twitch

how did you get 23

26. akhaliq99

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

27. akhaliq99

that is new numerator

28. akhaliq99

and denominator stays the same

29. twitch

oh okay so let me try again

30. twitch

23/5 - 5/2

31. akhaliq99
32. akhaliq99

yes thats right but dont forget the minus signs

33. twitch

okay the 23/5 would be negative right ?

34. akhaliq99

yes

35. akhaliq99

because 4(3/5) was negative

36. akhaliq99

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

37. akhaliq99

type in calculator and see you get the same number

38. twitch

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

39. akhaliq99

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

40. akhaliq99

yes

41. twitch

okay i got that

42. twitch

so were do i go from there

43. akhaliq99

just subtract the numerators and get the solution

44. twitch

18/10

45. akhaliq99

the denominator stays the same so -71/10

46. twitch

how did you get 71

47. akhaliq99

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

48. akhaliq99

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

49. twitch

I did'nt multipy anything

50. akhaliq99

do u see how I got that

51. twitch

you cross multiplyed?

52. akhaliq99

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. akhaliq99

oh sorry I wrote that wrong ignore it

54. akhaliq99

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

55. twitch

okay I see

56. twitch

so -71/10

57. akhaliq99

do you get it?

58. twitch

yea

59. twitch

-71/10 right and that can be simplified

60. akhaliq99

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

61. akhaliq99

yes correct!

62. twitch

cool thanks man

63. akhaliq99

no problem take care

64. twitch

you too

65. twitch

do you see what i mean