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juciystar234 Group Title

8- 6.2 divided by 5 + 7(0.91) help me please

  • 2 years ago
  • 2 years ago

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  1. niduj123 Group Title
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    13.3

    • 2 years ago
  2. juciystar234 Group Title
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    My textbook says 13.13 so I was wondering how they got that. Can you show me/ Tell me how you got that answer because I'm kinda confused...

    • 2 years ago
  3. niduj123 Group Title
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    its easy bc its basic order of operations

    • 2 years ago
  4. juciystar234 Group Title
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    Yeah I know NVM :) thanks

    • 2 years ago
  5. niduj123 Group Title
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    can i hav a medal o.O

    • 2 years ago
  6. niduj123 Group Title
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    tyvm

    • 2 years ago
  7. juciystar234 Group Title
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    np

    • 2 years ago
  8. asnaseer Group Title
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    for this:\[\frac{8- 6.2}{5 + 7(0.91)}\] you need to follow BODMAS - have you heard about that?

    • 2 years ago
  9. asnaseer Group Title
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    it is known by other names as well, see here: http://en.wikipedia.org/wiki/Order_of_operations

    • 2 years ago
  10. juciystar234 Group Title
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    Ok let me check it out hold on

    • 2 years ago
  11. asnaseer Group Title
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    look at the 2nd section "The standard order of operations"

    • 2 years ago
  12. juciystar234 Group Title
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    Ok hold on hmm SO MANY WORDS!! D:

    • 2 years ago
  13. niduj123 Group Title
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    lol typical wikipedia

    • 2 years ago
  14. juciystar234 Group Title
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    Ok I kinda got it

    • 2 years ago
  15. juciystar234 Group Title
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    (not really so much)

    • 2 years ago
  16. niduj123 Group Title
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    kwl i hope u pass :)

    • 2 years ago
  17. asnaseer Group Title
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    good - so first thing to attack is the brackets

    • 2 years ago
  18. juciystar234 Group Title
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    Thanks

    • 2 years ago
  19. juciystar234 Group Title
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    Ok

    • 2 years ago
  20. niduj123 Group Title
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    ^^...

    • 2 years ago
  21. asnaseer Group Title
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    in this case the brackets just contain a number - so no actual operation to perform inside the brackets

    • 2 years ago
  22. juciystar234 Group Title
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    ok

    • 2 years ago
  23. asnaseer Group Title
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    we can therefore remove the brackets to end up with:\[\frac{8- 6.2}{5 + 7(0.91)}=\frac{8- 6.2}{5 + 7*0.91}\]

    • 2 years ago
  24. juciystar234 Group Title
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    :p

    • 2 years ago
  25. juciystar234 Group Title
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    Mhm ok

    • 2 years ago
  26. juciystar234 Group Title
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    hmmm ok im confused...

    • 2 years ago
  27. asnaseer Group Title
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    lets jus concentrate on the denominator for now, we had:\[5+7(0.91)\]correct?

    • 2 years ago
  28. juciystar234 Group Title
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    yes

    • 2 years ago
  29. asnaseer Group Title
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    now note that a(b) simply means a*b - agreed?

    • 2 years ago
  30. juciystar234 Group Title
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    ok

    • 2 years ago
  31. juciystar234 Group Title
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    agreed

    • 2 years ago
  32. asnaseer Group Title
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    so we can say that:\[5+7(0.91)=5+7*0.91\]

    • 2 years ago
  33. asnaseer Group Title
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    does that make sense now?

    • 2 years ago
  34. juciystar234 Group Title
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    ok got tht

    • 2 years ago
  35. juciystar234 Group Title
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    yes

    • 2 years ago
  36. asnaseer Group Title
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    good - now what should the next set of operations be?

    • 2 years ago
  37. asnaseer Group Title
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    we have handled the brackets

    • 2 years ago
  38. juciystar234 Group Title
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    um to multiply?>

    • 2 years ago
  39. juciystar234 Group Title
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    sorry didnt mean to put >

    • 2 years ago
  40. asnaseer Group Title
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    it should be exponents and roots next - but you do not have any here so we go to the next one: multiplication an division

    • 2 years ago
  41. juciystar234 Group Title
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    Yea!! Ok

    • 2 years ago
  42. asnaseer Group Title
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    so what is 7 * 0.91 = ?

    • 2 years ago
  43. juciystar234 Group Title
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    Um hold on

    • 2 years ago
  44. juciystar234 Group Title
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    6.37

    • 2 years ago
  45. asnaseer Group Title
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    correct, so now we end up with:\[\frac{8- 6.2}{5 + 7(0.91)}=\frac{8- 6.2}{5 + 7*0.91}=\frac{8- 6.2}{5 + 6.37}\]now most people get confused here because they think the next thing to do is the division

    • 2 years ago
  46. juciystar234 Group Title
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    wouldnt you add? or subtract?

    • 2 years ago
  47. juciystar234 Group Title
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    add?

    • 2 years ago
  48. asnaseer Group Title
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    but what you need to remember is that you go through BODMAS for the numerator and the denominator seperately

    • 2 years ago
  49. juciystar234 Group Title
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    ok

    • 2 years ago
  50. asnaseer Group Title
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    hang on a second - I think I misread your question

    • 2 years ago
  51. asnaseer Group Title
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    I believe it was this instead:\[8- 6.2 \div 5 + 7(0.91)\]

    • 2 years ago
  52. asnaseer Group Title
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    am I right?

    • 2 years ago
  53. juciystar234 Group Title
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    yes

    • 2 years ago
  54. juciystar234 Group Title
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    wait

    • 2 years ago
  55. juciystar234 Group Title
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    yes

    • 2 years ago
  56. asnaseer Group Title
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    ok, sorry I originally interpreted it as:\((8- 6.2) \div (5 + 7(0.91))\)

    • 2 years ago
  57. juciystar234 Group Title
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    ohhh ok

    • 2 years ago
  58. asnaseer Group Title
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    so lets start again - ok?

    • 2 years ago
  59. juciystar234 Group Title
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    ok

    • 2 years ago
  60. asnaseer Group Title
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    \[8- 6.2 \div 5 + 7(0.91)\]first step - brackets to get:\[8- 6.2 \div 5 + 7(0.91)=8- 6.2 \div 5 + 7*0.91\]next is exponents/root but we have none next is multiplication/division - we have both, so you did 7*0.91 = 6.37\[8- 6.2 \div 5 + 6.37\]

    • 2 years ago
  61. asnaseer Group Title
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    thats how far we got

    • 2 years ago
  62. asnaseer Group Title
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    so next we should do what?

    • 2 years ago
  63. juciystar234 Group Title
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    add?

    • 2 years ago
  64. juciystar234 Group Title
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    or no subtract

    • 2 years ago
  65. asnaseer Group Title
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    nope - have a closer look at what is still left

    • 2 years ago
  66. juciystar234 Group Title
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    like left to right but switch add with division

    • 2 years ago
  67. asnaseer Group Title
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    it should be division next

    • 2 years ago
  68. juciystar234 Group Title
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    so divide?

    • 2 years ago
  69. juciystar234 Group Title
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    ok

    • 2 years ago
  70. asnaseer Group Title
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    so what is 6.2 divided by 5 = ?

    • 2 years ago
  71. juciystar234 Group Title
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    ok hold on

    • 2 years ago
  72. asnaseer Group Title
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    (a quick trick to divide by 5 is to divide by 10 and then halve the result)

    • 2 years ago
  73. juciystar234 Group Title
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    |dw:1347581921786:dw|

    • 2 years ago
  74. juciystar234 Group Title
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    sorry i was drawing :P

    • 2 years ago
  75. asnaseer Group Title
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    that is not correct

    • 2 years ago
  76. juciystar234 Group Title
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    o.o

    • 2 years ago
  77. juciystar234 Group Title
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    ok :) so now how do i do it ? :|

    • 2 years ago
  78. asnaseer Group Title
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    the /quick/ method or using long division like you attempted up there?

    • 2 years ago
  79. juciystar234 Group Title
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    or like were did i mess up

    • 2 years ago
  80. juciystar234 Group Title
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    um i guess....

    • 2 years ago
  81. juciystar234 Group Title
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    go on

    • 2 years ago
  82. asnaseer Group Title
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    |dw:1347582167712:dw|

    • 2 years ago
  83. juciystar234 Group Title
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    oh

    • 2 years ago
  84. juciystar234 Group Title
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    i get it!!!

    • 2 years ago
  85. juciystar234 Group Title
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    my decimal messed me up..

    • 2 years ago
  86. asnaseer Group Title
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    the other way is 6.2 divided by 10 is 0.62 double that is 0.62 + 0.62 = 1.24 (sorry I incorrectly stated you halve the result up there - it should be double the result after dividing by 10)

    • 2 years ago
  87. juciystar234 Group Title
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    Hmmm ok

    • 2 years ago
  88. asnaseer Group Title
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    ok, so we now have:\[8- 6.2 \div 5 + 6.37=8-1.24+6.37\]

    • 2 years ago
  89. asnaseer Group Title
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    the rest should now be straight forward

    • 2 years ago
  90. juciystar234 Group Title
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    so adding?

    • 2 years ago
  91. asnaseer Group Title
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    sure

    • 2 years ago
  92. juciystar234 Group Title
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    ok

    • 2 years ago
  93. asnaseer Group Title
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    but be careful with the signs

    • 2 years ago
  94. juciystar234 Group Title
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    I got this part let me draw it for you

    • 2 years ago
  95. juciystar234 Group Title
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    |dw:1347582462471:dw|

    • 2 years ago
  96. asnaseer Group Title
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    remember the 1.24 has a minus sign next to it

    • 2 years ago
  97. asnaseer Group Title
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    so this is really "-1.24 + 6.37"

    • 2 years ago
  98. juciystar234 Group Title
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    no thats not a negative its a minus

    • 2 years ago
  99. asnaseer Group Title
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    so it might be better to first do "8 - 1.24"

    • 2 years ago
  100. juciystar234 Group Title
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    ok

    • 2 years ago
  101. juciystar234 Group Title
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    6.76?

    • 2 years ago
  102. juciystar234 Group Title
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    then add

    • 2 years ago
  103. asnaseer Group Title
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    think of it in this way:\[8- 6.2 \div 5 + 6.37=8-1.24+6.37=8+(-1.24)+6.37\]

    • 2 years ago
  104. asnaseer Group Title
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    yes add next

    • 2 years ago
  105. juciystar234 Group Title
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    ok so 13.13

    • 2 years ago
  106. asnaseer Group Title
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    I was trying to explain why you had to do "-1.24 + 6.37" previously

    • 2 years ago
  107. juciystar234 Group Title
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    Yaaa i got it my text book says that but i needed to work it out thank you!!!!!

    • 2 years ago
  108. asnaseer Group Title
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    yes - that is the correct answer

    • 2 years ago
  109. juciystar234 Group Title
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    ok

    • 2 years ago
  110. asnaseer Group Title
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    yw :)

    • 2 years ago
  111. juciystar234 Group Title
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    Thanks once again!! :D

    • 2 years ago
  112. asnaseer Group Title
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    np :)

    • 2 years ago
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