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http://www.youtube.com/watch?v=-eUfNBD4Kwc

are you asking for the definition?

ok wait wht is the multiplicative inverse of 5/7?

7/5

ohhhhhh ok thank u

Do you understand now?

yea i do

wait so would the inverse of -2 3/4 be 4/11?

|dw:1360271797991:dw|

|dw:1360271859211:dw|

wait im confused

wait wait wait never mind

You are missing the minus sign.

oh so its -4/11?

Correct. What is the multiplicative inverse of -1?

1/-1 right?

What does that equal?

-1

Correct, excellent. how about the multiplicative inverse of 0?

wouldnt tht just b 0?

Are you sure? Think about it....

wait 1?

Please don't guess. Try to come up with a reasonable answer.

well im not trying 2 guess

wait it is 0

0/1 would b 1/0

|dw:1360273959086:dw|

ohhhh so the answer is 1?

No.

ugh then wht is it?

The answer is "there is no answer"

omg thts wht my calculator said

0.5

Correct.

YAY!!!! i finally understand something

What is the reciprocal of 0.5?

1/0.5?

Yes!!! simplify that please. What number multiplied by 0.5 equals 1?

Correct.

kk give me another one

What is the reciprocal of 0?

wait we just did this one

Follow the steps I gave you above.

0 * b = 1

EXCELLENT!!! Now you are really learning :-D

lol so then it would b 1/0?

$$\frac{1}{0}$$ is not a number, because division by 0 is undefined.

well yea but if we were using different numbers would it look almost like tht?

Give me an example please.

like in the problem im doing now
hold on

\[4\frac{ 1 }{ 8} would be \frac{ 8 }{ 33 } \]

right?

Yes.

YAY!!!!

OMG tht makes soooo much sense now

|dw:1360276164935:dw|

nope

So what is the answer to "what is the multiplicative inverse of 0?"

|dw:1360276813364:dw|

there is no answer u cant put any number there

Correct.

yay omg thank u so much

np :)

:)

wait can u help me with another problem?

thts the problem^^^

Any ideas?

well idk how 2 set the problem up

Decide what unknown number is asked for and what facts are known.

do i have 2 convert 1 1/2 into an improper fraction?

Yes.

ok so thts 3/2

Correct.

then do i put 156 over 1?

Yes.

so would it b \[\frac{ 156 }{ 1 } - \frac{ 3 }{ 2 }\]

|dw:1360277686583:dw|

oh so its 156 divided by 3/2?

Yes.

so its 312/3

so the answers 104 ounces?

Not ounces, but how many times heavier.

ohhhhh kk thank u