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

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Reply 20

Miss Anonymous

Original post by iPad User

So eg, increase by 99% its 1.99?

yes

Reply 21

The-Real-One

Original post by iPad User

Your the one with an apple logo as a avatar.

oh the irony...

Reply 22

iainthegreat

Original post by iPad User

Ohh, thanks :smile:

So eg, increase by 99% its 1.99?

Exactly.

Reply 23

The_Internet

Original post by iPad User

Ohh, thanks :smile:

So eg, increase by 99% its 1.99?

yes

Wow.

That is all.

You can also divide by .74 :wink:

Reply 26

Lewk

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? :smile:

isn't decreasing it by 75% multiplying by 0.25? multiplying by 0.75 is 75% of x

Reply 27

z0tx

Original post by iPad User

Ohh, thanks :smile:

So eg, increase by 99% its 1.99?

Yes

1.26

Strong username to post content ratio

Reply 30

The_Internet

Original post by Young Spade

You can also divide by .74 :wink:

That doesn't work?

100/0.74 = 135.1351351351351
100*1.26 = 126

how old are you?

What they said

Original post by iPad User

Ohh, thanks :smile:

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 :tongue:

Reply 34

the_gooner

Divide by 2.
Then multiply by 7.
Then multiply by 0.36

Reply 35

Young Spade

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)

Reply 36

I smell like maths

you could divide by (50/63)

:smile:

Reply 37

Lightnix

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

Reply 38

iainthegreat