bakonloverk
  • bakonloverk
what is the multiplicative inverse?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
http://www.youtube.com/watch?v=-eUfNBD4Kwc
anonymous
  • anonymous
are you asking for the definition?
anonymous
  • anonymous
multiplicative inverse (mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2; the multiplicative inverse of 7 is 1/7.

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More answers

bakonloverk
  • bakonloverk
ok wait wht is the multiplicative inverse of 5/7?
anonymous
  • anonymous
the inverse of a number means that if you multiply the number by its inverse you will get 1. so therefore, to work out the inverse you do 1 divided by the number.
anonymous
  • anonymous
7/5
bakonloverk
  • bakonloverk
ohhhhhh ok thank u
skullpatrol
  • skullpatrol
Do you understand now?
bakonloverk
  • bakonloverk
yea i do
bakonloverk
  • bakonloverk
wait so would the inverse of -2 3/4 be 4/11?
skullpatrol
  • skullpatrol
|dw:1360271797991:dw|
skullpatrol
  • skullpatrol
|dw:1360271859211:dw|
bakonloverk
  • bakonloverk
wait im confused
bakonloverk
  • bakonloverk
wait wait wait never mind
skullpatrol
  • skullpatrol
You are missing the minus sign.
bakonloverk
  • bakonloverk
oh so its -4/11?
skullpatrol
  • skullpatrol
Correct. What is the multiplicative inverse of -1?
bakonloverk
  • bakonloverk
1/-1 right?
skullpatrol
  • skullpatrol
What does that equal?
bakonloverk
  • bakonloverk
-1
skullpatrol
  • skullpatrol
Correct, excellent. how about the multiplicative inverse of 0?
bakonloverk
  • bakonloverk
wouldnt tht just b 0?
skullpatrol
  • skullpatrol
Are you sure? Think about it....
bakonloverk
  • bakonloverk
wait 1?
skullpatrol
  • skullpatrol
Please don't guess. Try to come up with a reasonable answer.
bakonloverk
  • bakonloverk
well im not trying 2 guess
skullpatrol
  • skullpatrol
I know, I know.... sorry but this is one of THE most difficult questions to understand for most students, I apologize.
bakonloverk
  • bakonloverk
wait it is 0
skullpatrol
  • skullpatrol
A multiplicative inverse is also called a "reciprocal" as is DEFINED as so, reciprocals: Two numbers whose product is 1.
bakonloverk
  • bakonloverk
0/1 would b 1/0
skullpatrol
  • skullpatrol
|dw:1360273959086:dw|
bakonloverk
  • bakonloverk
ohhhh so the answer is 1?
skullpatrol
  • skullpatrol
No.
bakonloverk
  • bakonloverk
ugh then wht is it?
skullpatrol
  • skullpatrol
The answer is "there is no answer"
bakonloverk
  • bakonloverk
omg thts wht my calculator said
skullpatrol
  • skullpatrol
Let me show you the DEFINING equation for reciprocals again: $$a*b=1$$ When asked to find the reciprocal of a number replace one of the letters in this equation with that number and solve for the other letter, for example: what is the reciprocal of 2? So $$2*b=1$$ What number multiplied by 2 gives 1?
bakonloverk
  • bakonloverk
0.5
skullpatrol
  • skullpatrol
Correct.
bakonloverk
  • bakonloverk
YAY!!!! i finally understand something
skullpatrol
  • skullpatrol
What is the reciprocal of 0.5?
bakonloverk
  • bakonloverk
1/0.5?
skullpatrol
  • skullpatrol
Yes!!! simplify that please. What number multiplied by 0.5 equals 1?
bakonloverk
  • bakonloverk
2
skullpatrol
  • skullpatrol
Correct.
bakonloverk
  • bakonloverk
kk give me another one
skullpatrol
  • skullpatrol
What is the reciprocal of 0?
bakonloverk
  • bakonloverk
wait we just did this one
skullpatrol
  • skullpatrol
Follow the steps I gave you above.
bakonloverk
  • bakonloverk
0 * b = 1
skullpatrol
  • skullpatrol
EXCELLENT!!! Now you are really learning :-D
bakonloverk
  • bakonloverk
lol so then it would b 1/0?
skullpatrol
  • skullpatrol
$$\frac{1}{0}$$ is not a number, because division by 0 is undefined.
bakonloverk
  • bakonloverk
well yea but if we were using different numbers would it look almost like tht?
skullpatrol
  • skullpatrol
Give me an example please.
bakonloverk
  • bakonloverk
like in the problem im doing now hold on
bakonloverk
  • bakonloverk
\[4\frac{ 1 }{ 8} would be \frac{ 8 }{ 33 } \]
bakonloverk
  • bakonloverk
right?
skullpatrol
  • skullpatrol
Yes.
bakonloverk
  • bakonloverk
YAY!!!!
skullpatrol
  • skullpatrol
Let me try and explain why you can never divide by 0. Dividing by 0 would mean multiplying by the reciprocal of 0, but 0 has no reciprocal because 0 times ANY number is 0, NOT 1.
bakonloverk
  • bakonloverk
OMG tht makes soooo much sense now
skullpatrol
  • skullpatrol
|dw:1360276164935:dw|
bakonloverk
  • bakonloverk
nope
skullpatrol
  • skullpatrol
So what is the answer to "what is the multiplicative inverse of 0?"
skullpatrol
  • skullpatrol
|dw:1360276813364:dw|
bakonloverk
  • bakonloverk
there is no answer u cant put any number there
skullpatrol
  • skullpatrol
Correct.
bakonloverk
  • bakonloverk
yay omg thank u so much
skullpatrol
  • skullpatrol
np :)
bakonloverk
  • bakonloverk
:)
bakonloverk
  • bakonloverk
wait can u help me with another problem?
bakonloverk
  • bakonloverk
the smallest owl found in the united states is the elf owl, which weighs 1 1/2 ounces. one of the largest owls is the Eurasian eagle owl which weighs nearly 10 pounds or 156 ounces. the Eurasian eagle owl is how many times as heavy as the elf owl?
bakonloverk
  • bakonloverk
thts the problem^^^
skullpatrol
  • skullpatrol
Any ideas?
bakonloverk
  • bakonloverk
well idk how 2 set the problem up
skullpatrol
  • skullpatrol
Decide what unknown number is asked for and what facts are known.
bakonloverk
  • bakonloverk
do i have 2 convert 1 1/2 into an improper fraction?
skullpatrol
  • skullpatrol
Yes.
bakonloverk
  • bakonloverk
ok so thts 3/2
skullpatrol
  • skullpatrol
Correct.
bakonloverk
  • bakonloverk
then do i put 156 over 1?
skullpatrol
  • skullpatrol
Yes.
bakonloverk
  • bakonloverk
so would it b \[\frac{ 156 }{ 1 } - \frac{ 3 }{ 2 }\]
skullpatrol
  • skullpatrol
|dw:1360277686583:dw|
bakonloverk
  • bakonloverk
oh so its 156 divided by 3/2?
skullpatrol
  • skullpatrol
Yes.
bakonloverk
  • bakonloverk
so its 312/3
bakonloverk
  • bakonloverk
so the answers 104 ounces?
skullpatrol
  • skullpatrol
Not ounces, but how many times heavier.
bakonloverk
  • bakonloverk
ohhhhh kk thank u

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