This is other that has been bugging me a long time, so ns just had actually to make a write-up come clarify the topic a bit.

You are watching: What does twice as much mean

A very common mistake, or just something world don"t yes, really pay attention to or treatment about, is to say "two time more" (or any variety of times, 2 is just an instance here) when they actually average "twice as much".

"But they"re the same, what"s the difference?" ns hear people already murmuring inside their heads. Wrong, they"re not the same, and the difference can be (in a very concrete, real-life way) huge. I"ll give you a pair of examples to clarify the difference.

If you have one dollar and also I promise to offer you one time more (meaning 100% more) it"s very easy, grade-school mathematics to calculate the 1 + 1 * 1 = 2. When people say "it costs two times more" they often mean that something, which supplied to expense 1 dissension now prices 2 dollars. But, how could that be once it was already shown that just "one time more" already makes the 1-dollar item price 2 dollars; how could "two times more" be as much as "one time more"? The price is simple: the isn"t - "two times more" would certainly make that 1-dollar item price 3 dollars (1 + 2 * 1 = 3)! "X time more" method addition on peak of what you currently have!

"Nonsense", ns hear people saying, yet it isn"t. "One time more" way the very same as "one hundred percent addition", or "twice as much", or "double the amount". "Two time more" way the exact same as "two hundred percent addition", or "three times together much", or "triple the amount".

People also an extremely often make the same mistake in the contrary direction, just this time the difference in between what"s gift said and also what"s actually being meant is far bigger 보다 in the instance of addition.

"His Toyota moves three times slower 보다 my Porsche" is how you might hear someone bragging about his new car. What a lot of of civilization just don"t establish is that while lock mean, because that example, that the Toyota is relocating at 100km/h (60mph) and the Porsche in ~ 300km/h (180mph), they"re actually saying that the Toyota is moving 600km/h (360mph) on reverse - rather a feat for any type of car, I"d say! Again, an example to clarification what I"m saying:

John has one dollar i m sorry he offers to charity, leave him through no cash ~ above him. This way he gave away 100% the - or one time - his resources stock.

A mainly later, John has ten dollars in cash, i beg your pardon he loans to his uncle Bob. Once again, john is left through nothing ~ above him. Thus, as soon as again, he offered away one time the amount he had - all 100% the it.

So, if one time less way you"re left through zero, regardless of exactly how much you initially had, wouldn"t it plainly imply the two time less way you subtract the initial amount twice, which would certainly not just take away every little thing you had, however it would likewise drag friend one time the initial amount ~ above the negative scale: 1 - 2 * 1 = -1. As soon as again, very straightforward grade-school math. So, if the Porsche guy wanted to say that his vehicle travels three times together fast as the Toyota, the correct means of saying it from the Toyota driver"s perspective would be the the Toyota travel at one third that the velocity that the Porsche, no three times slower as our clueless Porsche braggart is ignorantly claiming.

The same uses everywhere; over there are tons of TV advertisement stating something is two time cheaper than before, or that some miraculous hair balsam will offer you ten times less dandruff. Precisely what the hell is that supposed to median - minus ripe times the amount of dandruff? You no only remove all the dandruff you had yet your scalp also sucks the dandruff out of the heads of the nine human being nearest to you and makes that disappear? Why do I uncover that extremely hard to believe? the course, the correct method of putting it would certainly be the the balsam will certainly make the amount of dandruff drop to one tenth - or through 90% - contrasted to the situation before using it.

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Summary

What"s being stated | What it actually means--------------------+----------------------- 2 times much more | X + 2 * X = 3X twice as much | 2 * X = 2X double the amount | 2 * X = 2X | two times much less | X - 2 * X = -X half as much | (1/2) * X = (1/2)Xone fifty percent the amount | (1/2) * X = (1/2)Xwhere X is the original amount us have.