anonymous
  • anonymous
What is the value of the expression? 6 • [(32 − 8) ÷ 4 + 2]
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
butterflydreamer
  • butterflydreamer
solve what's in the brackets first! (32 - 8) = ?
OnePieceFTW
  • OnePieceFTW
Order of operations say to do parentheses first.

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anonymous
  • anonymous
24
butterflydreamer
  • butterflydreamer
Good and now 24 divided by 4 = ?
anonymous
  • anonymous
= 6
butterflydreamer
  • butterflydreamer
correct! Now add 2 . 6 + 2 =?
anonymous
  • anonymous
=8
butterflydreamer
  • butterflydreamer
yep and now, multiply by 6 and you're done :)
anonymous
  • anonymous
can you help me with a few mor like this
anonymous
  • anonymous
so the answer is 78
butterflydreamer
  • butterflydreamer
Sure. I've noticed that you've been posting similar questions though. Just remember the order of operations and BODMAS and you'll be fine :) And that is not quite the answer. 6 times 8 = ?
anonymous
  • anonymous
oh = 48
anonymous
  • anonymous
im sorry
butterflydreamer
  • butterflydreamer
that's correct :) Also, if you don't understand BODMAS, it's the same as PEMDAS http://prntscr.com/86271w <- super helpful reference with order of operations!
anonymous
  • anonymous
ok so you can help me with two more qestions right
OnePieceFTW
  • OnePieceFTW
BODMAS was before we added exponents to the mnemonic
anonymous
  • anonymous
Which placement of grouping symbols in the expression gives it a value of 22? 3 • 4 – 2 + 5 +7 A. 3 • [4 – (2 + 5) + 7] B. (3 • 4) – [2 + (5 + 7)] C. [(3 • 4) – 2] + (5 + 7) D. 3 • (4 – 2) + (5 + 7)
anonymous
  • anonymous
thats the nest one
mathstudent55
  • mathstudent55
Try each choice using the correct order of operations, and see which one gives you the answer you need.
anonymous
  • anonymous
ok
mathstudent55
  • mathstudent55
What does the O mean in BODMAS?
anonymous
  • anonymous
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mathstudent55
  • mathstudent55
The way to do a problem like this is to do one step at a time and writing everything else each step. Of course, you need to follow PEMDAS for each step. 6 • [(32 − 8) ÷ 4 + 2] = = 6 • [24 ÷ 4 + 2] = 6 • [6 + 2] = 6 • 8 = 48 By writing everything each step, you don't forget any operation.
mathstudent55
  • mathstudent55
Also, it is important to understand PEMDAS properly. Most people don't know how it works.
mathstudent55
  • mathstudent55
@jpharper Let's work through each choice of the second problem.
anonymous
  • anonymous
ok
mathstudent55
  • mathstudent55
A. 3 • [4 – (2 + 5) + 7] = Innermost parentheses first: = 3 • [4 – 7 + 7] We still have the square parentheses, so we do that next.
anonymous
  • anonymous
ok
mathstudent55
  • mathstudent55
Inside the square brackets, we have a subtraction and an addition. In PEMDAS, AS means addition, Subtraction. Those two operations are the same level of priority, so we do them in the order they appear from left to right. = 3 • [-3 + 7] = 3 • 4 = 12
anonymous
  • anonymous
this is the answer [(3 • 4) – 2] + (5 + 7)
mathstudent55
  • mathstudent55
This is what I meant by understanding PEMDAS properly. Do operations of each line before the next line below. P - parentheses E - exponents MD - multiplications and divisions in the order they appear from left to right AS - additions and subtractions in the order they appear from left to right
mathstudent55
  • mathstudent55
Many people think that PEMDAS means doing the operations in the order below, but that is incorrect. P - parentheses \ E - exponents \ M - multiplications \ D - divisions / The PEMDAS shown to the left is incorrect. A - additions / S -subtractions / The correct order is what I wrote in the previous response above with MD in one line and AS in one line.
mathstudent55
  • mathstudent55
Yes, you are correct.

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