Question

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

Answer 1

13.3

Answer 2

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...

Answer 3

its easy bc its basic order of operations

Answer 4

Yeah I know NVM :) thanks

Answer 5

can i hav a medal o.O

Answer 6

tyvm

Answer 7

np

Answer 8

for this:\[\frac{8- 6.2}{5 + 7(0.91)}\]
you need to follow BODMAS - have you heard about that?

Answer 9

it is known by other names as well, see here: http://en.wikipedia.org/wiki/Order_of_operations

Answer 10

Ok let me check it out hold on

Answer 11

look at the 2nd section "The standard order of operations"

Answer 12

Ok hold on hmm SO MANY WORDS!! D:

Answer 13

lol typical wikipedia

Answer 14

Ok I kinda got it

Answer 15

(not really so much)

Answer 16

kwl i hope u pass :)

Answer 17

good - so first thing to attack is the brackets

Answer 18

Thanks

Answer 19

Ok

Answer 20

^^...

Answer 21

in this case the brackets just contain a number - so no actual operation to perform inside the brackets

Answer 22

ok

Answer 23

we can therefore remove the brackets to end up with:\[\frac{8- 6.2}{5 + 7(0.91)}=\frac{8- 6.2}{5 + 7*0.91}\]

Answer 24

:p

Answer 25

Mhm ok

Answer 26

hmmm


ok im confused...

Answer 27

lets jus concentrate on the denominator for now, we had:\[5+7(0.91)\]correct?

Answer 28

yes

Answer 29

now note that a(b) simply means a*b - agreed?

Answer 30

ok

Answer 31

agreed

Answer 32

so we can say that:\[5+7(0.91)=5+7*0.91\]

Answer 33

does that make sense now?

Answer 34

ok got tht

Answer 35

yes

Answer 36

good - now what should the next set of operations be?

Answer 37

we have handled the brackets

Answer 38

um to multiply?>

Answer 39

sorry didnt mean to put >

Answer 40

it should be exponents and roots next - but you do not have any here

so we go to the next one: multiplication an division

Answer 41

Yea!! Ok

Answer 42

so what is 7 * 0.91 = ?

Answer 43

Um hold on

Answer 44

6.37

Answer 45

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

Answer 46

wouldnt you add? or subtract?

Answer 47

add?

Answer 48

but what you need to remember is that you go through BODMAS for the numerator and the denominator seperately

Answer 49

ok

Answer 50

hang on a second - I think I misread your question

Answer 51

I believe it was this instead:\[8- 6.2 \div 5 + 7(0.91)\]

Answer 52

am I right?

Answer 53

yes

Answer 54

wait

Answer 55

yes

Answer 56

ok, sorry I originally interpreted it as:\((8- 6.2) \div (5 + 7(0.91))\)

Answer 57

ohhh ok

Answer 58

so lets start again - ok?

Answer 59

ok

Answer 60

\[8- 6.2 \div 5 + 7(0.91)\]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\[8- 6.2 \div 5 + 6.37\]

Answer 61

thats how far we got

Answer 62

so next we should do what?

Answer 63

add?

Answer 64

or no subtract

Answer 65

nope - have a closer look at what is still left

Answer 66

like left to right but switch add with division

Answer 67

it should be division next

Answer 68

so divide?

Answer 69

ok

Answer 70

so what is 6.2 divided by 5 = ?

Answer 71

ok hold on

Answer 72

(a quick trick to divide by 5 is to divide by 10 and then halve the result)