Pity Four Fours
“How
d’you make the number 7, just using the number 4 four times?”
(One
possible answer is
)
You have probably been asked something similar at some time during your mathematical life.
In fact, there are lots of other ways to
make 7, including
and
This gives you a couple of nice Sneaky Tricks that may be new to you:
4! = 4 x 3 x 2 x 1 = 24
and
The
Problem:
Well here’s the full Problem – all grown-up and really quite tricky in places:
“How d’you make all the numbers from 1 to 20, just using the number 4 four times?”
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