Maths Trick Question

Factual Questions
1

Last Friday night I was given a page of math trick things to do. I could do most of them, but the one that I can’t get (and noone has the answer sheet to) has to do with four 4’s.

Basically there are four 4’s on the page and you put a +, -, *, / or () around the fours to get them to equal the numbers from one to ten;

eg - (4 + 4 + 4) / 4 = 3

I can get all of them except 10, so how does one fill in

4 4 4 4 = 10?

I am sure there is a resource for stuff like this on the web, but all I came across in my scant survey (math, trick, four, etc) were jokes and impossible mathematics (division by zero etc).

Thanks,
FloChi

2

How about (44-4)/4?

3

How about (44-4)/4? They don’t say that you HAVE to put operators between the numbers :slight_smile:

4

Grrr. Karl Gauss beat me to it, but here’s another:
4 + 4 + sqrt(4) + sqrt(4)

Also, here’s a list of links to what is apparently known as the Four Fours puzzle

5

Thanks for that, guess it was another of those lateral puzzles.

Thanks evilhanz and Karl Gauss, although the second solution doesn’t work as one can’t use the sqrt function.
Thanks,
Flochi

6

4 + 4 + sqrt(4) + sqrt(4) = 12 not 10

7

4 + 4 + 4 - sqrt(4) = 10

If sqrt was allowed

8

I remember being obsessed with this many years ago. Depending on which functions you are allowed to apply, you can go up into the hundreds before your mind shuts down from the fours floating through it destroying synapses.