'three times as much' vs 'three times more'

According to our school's maths teachers, if the mother has 100 dollars:

1)" the father has 3 times more money than the mother " means the father has 400 dollars.

2) "the father has 3 times as much money as the mother" means the father has 300 dollars.

Hope to hear from teachers from this forum too.
Mengxin means that when we are dealing with big numbers, it does not make a big difference to use one term in place of the other because the result will be almost the same. You know, for example, 1000 is not very different from 1001. However, in your case, the difference between 3 and 4 is noticeable.

Well, I'm not really sure if I could clarify it.Smile
You’re no more than asking me to make a summary of the above posts. Smile Ok, let me present here what I understand about “n times larger than ” vs “n times as much as”.

As above posts have said, “n times larger than” may be understood in two ways, but the correct version is “If A is n times larger than B, then A = (n+1)B”. However, we can’t expect people are always so precise about arithmetic things in daily life, so on many occasions the two terms are used interchangeably.

I think what you are worried about is whether natives will misunderstand the intended meaning if the two terms are used interchangeably, aren’t you? Of course the chances are rare. You know, if the speaker is aware of the possible misunderstanding or needs to make difference about such things, s/he may avoid using the “larger than” thing. On the other hand, seldom would people make great efforts to differentiate 1001 and 1000. Would you?

I am sorry for not amswering your question technically.

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