To increase a number by 26% you multiply it by? Watch

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Miss Anonymous
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#21
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#21
(Original post by iPad User)
So eg, increase by 99% its 1.99?
yes
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The-Real-One
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#22
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#22
(Original post by iPad User)
Your the one with an apple logo as a avatar.
oh the irony...
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iainthegreat
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#23
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#23
(Original post by iPad User)
Ohh, thanks
So eg, increase by 99% its 1.99?
Exactly.
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The_Internet
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#24
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#24
(Original post by iPad User)
Ohh, thanks
So eg, increase by 99% its 1.99?
yes
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aeterno
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#25
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#25
Wow.

That is all.
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Young Spade
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#26
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#26
You can also divide by .74
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Lewk
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#27
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#27
(Original post by iainthegreat)
Ok, so think of 1 as being 100%. In that, if you times a number by 1, it is still at 100%, there's no increase or decrease.

So if you wished to increase by, say, 50%. You'd multiply by 1.5

Increase by 100%, times by 2.

Decrease by 75%, times by 0.75

Do you get the picture?
isn't decreasing it by 75% multiplying by 0.25? multiplying by 0.75 is 75% of x
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z0tx
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#28
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#28
(Original post by iPad User)
Ohh, thanks
So eg, increase by 99% its 1.99?
Yes
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thegodofgod
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#29
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#29
1.26
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Nick Longjohnson
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#30
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#30
Strong username to post content ratio
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The_Internet
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#31
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#31
(Original post by Young Spade)
You can also divide by .74
That doesn't work?

100/0.74 = 135.1351351351351
100*1.26 = 126
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int92
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#32
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#32
how old are you?
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username533239
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#33
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#33
What they said
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I smell like maths
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#34
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#34
(Original post by iPad User)
Ohh, thanks
So eg, increase by 99% its 1.99?
yes...

btw an increase of 26% is a multiplication of 1.26

in case you didnt know already
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the_gooner
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#35
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#35
Divide by 2.
Then multiply by 7.
Then multiply by 0.36
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Young Spade
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#36
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#36
(Original post by de_monies)
That doesn't work?

100/0.74 = 135.1351351351351
100*1.26 = 126
Why wouldn't this work? I was always under the assumption that...w ell you have 100 percent. Multiplying by .50 is the same as dividing by 2 (.5 x 2 = 1)
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I smell like maths
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#37
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#37
you could divide by (50/63)

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Lightnix
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#38
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#38
(Original post by Young Spade)
Why wouldn't this work? I was always under the assumption that...w ell you have 100 percent. Multiplying by .50 is the same as dividing by 2 (.5 x 2 = 1)
If you want to make a division equivalent to a multiplication, you must divide by the reciprocal (1/x) of the number you would multiply by (x).

For example: (2/3)*(3/4) is equal to (2/3)/(4/3).

In the context of percentages it helps to understand percentage decrease vs. percentage increase.

Say we want to increase 100 by 70%, we'd do 100 * 1.7 to get 170 right? However, if you were to do the equivalent of what you did (do 1-.26 to get .74) and multiply 170 by 30% (170*.3) we get something close to 51. Oh dear something's gone a bit wrong there hasn't it?

What we want to do is to calculate the percentage decrease from 170 to 100. Basically what we want to know is "what percentage of 170 do we need to subtract from 170 to get 100?" That's not terribly hard to do, it's the same as working out what 100 is as a percentage of 170, it's just (100/170)*100 = ~55.82% or we can just use (10/17). 170*(10/17) = 100.

It stands to reason that 100/(10/17) = 170 again, and it does.

a quicker version of this principle can be applied to the 126% thing like this:
(1/1.26)=~.79
and 100/.79 ~= 126
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iainthegreat
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#39
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#39
(Original post by Lewk)
isn't decreasing it by 75% multiplying by 0.25? multiplying by 0.75 is 75% of x
Oops, meant decrease it to 75%, my bad, will change it now thanks
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iPad User
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#40
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#40
(Original post by int92)
how old are you?
14...
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