Can anybody solve this and explain? 66 and 2/3%-45=

My son is struggling with this and I can't explain it because I don't understand it either.

66 2/3 = 65 5/3
45 = 44 3/3
_____
21 2/3

OR:

I convert 66 2/3 into a decimal. 2/3 = .66666 yada yada

So 66.666 minus 45 is 21.6666

can u explain in another way?

by the way this is Marquis.

heybaby said:

Hi Marquis.

Do you know how to convert fractions to decimals?

Does the book provide an example?

Can you type one here?

Maybe I'll be better able to explain it if I know what the book is saying.

Is the question posted exactly as it's written in the book?

coolcat said:

Yeah, I'm trying to figure out how I need to go about trying to explain the answer.

Vendetta1 said:

I get the feeling that there should be a multiply there:

(66 and 2/3 %) x (-45)

ie: what is 66 and 2/3 % of -45...

if that's the case then:

(66 2/3)% x (-45)

= (200/3)% x (-45)

= (200/300) x (-45)

= (2/3) x (-45)

= -30

But that's only if there's that multiply there...

coolcat said:

I was thinking that same thing!!!

Vendetta1 said:

the examples were:

Percent of Decrease: original price minus new price divided by original.

perc. of increase: new price minus original price divided by original.

Since there is no trailing decimal after the "45", think of it as 66.667 - 45.000.

66.667-
45.000
-----

21.667

All you have to do is subtract 45 from 66. The .6667 is subtracting 0.000, so it just carries down.

coolcat said:

Yeah, if it's a multiplication problem, you got it right!

Vendetta1 said:

heybaby said:

Can you check the question and make sure it's posted exactly the same?

coolcat said:

What is 66 and 2/3% less than 45?

heybaby said:

Ah.... so the question is asking... take 45... subtract 66 2/3% of it... what is the result... so what you want to do is:

45 - (66 2/3 %)x45

= 45 - (200/3 %)x45

= 45 - (200/300)x45

= 45 - (2/3)x45

= 45 -30

= 15

Hope that helps.

Now you can check your answer, to make sure. Use the definition of percentage decrease... see if you get back 66 2/3 %...

Thanks ya'll :crazy:

Marquis has went to bed. I will show him this thread in the morning. But still keep the different ways of answering the question coming-hope he gets it. Coolcat I get yours-Sorta

Anxiety said:

that's how I feel.

coolcat said:

that is beautiful....I love math

thekidsgirl said:

I'm with Anx

thekidsgirl said:

So do I.

heybaby said:

(to you and Marquis)

I think 15 is right. The others seem to agree.
[Edited 7/20/09 20:19pm]

Vendetta1 said:

I go as far as Geometry goes and thats it

heybaby said:

I like math too. But I totally understand the stress it causes.

heybaby said:

OMG! I got to teach one of my student Geometry last school year and it was amazing going over all that again
Polygons must be like aphrodisiacs

Fractions are your friends! The question basically asked what is 2/3 off of 45. Yes, the answer is 15.

thekidsgirl said:

the pythagorean theorem