# Thread: use only four 4's to make 10

1. ## use only four 4's to make 10

hi its my second day at high school and they given me homework due in tomorrow morning plz help

ive got to get four 4's into 10

for example if i had to get four 4's into 8 i could do

4 x 4 -4-4 = 8
can use no other numbers but 4 and only 4 times

for the number 7 i got 4 + 4 - (4/4) = 7

plz help !!
very grateful ty

2. ((4+4)/4) + (4+4) = 2 + 8

3. Originally Posted by Maths_Tutoring
((4+4)/4) + (4+4) = 2 + 8
Thats five fours.

4. thats 5

5. i thot he said four 4s?

im counting 5

are you sure theres no other things we can use besides +- /*?

6. u can use any simbols
but only 4 4's
no other numbers no less and no more than 4 4's

7. 4*4 -4 - sqrt(4)

8. only onther way to do it i guess didnt really wanna use square root
not sur eif teACHEr will accept, i got 4 + sqr 4 +sqr 4 +sqrt4

thanks for d help guyz

4*4 -4 - sqrt(4)
If it was in exponential format, we'd have $4*4-4-(4)^{1/2}$, which introduces a 2 that we don't want.

If we were to just use symbols, your way is good. [Assuming that $\sqrt{4}>0\implies \sqrt{4}=2~and~not~\pm2$]

--Chris

10. aahhhh bustin mah chops

i cant see any other way...

11. eeepps, I thought this was just asking for fours not four fours! a little tricker than I first thought, will have to have a re-think
yup, with out using sqrts it's a toughy, since it really only leaves you with a few options to play with

4! = 24
4toThe4 = 256
4*4 = 16
4+4 = 8

12. $\frac{44-4}{4}$

13. Originally Posted by Chris L T521
$\sqrt{4}>0\implies \sqrt{4}=2~and~not~\pm2$]

--Chris
$\sqrt{4}$ EQUALS 2, there's no question about it !

14. Originally Posted by Moo
$\sqrt{4}$ EQUALS 2, there's no question about it !
What he meant that this doesn't fit the requirements of four 4's. There will be a $\frac{1}{2}$, should it be written as an exponent.

15. Originally Posted by skeeter
$\frac{44-4}{4}$
Ermm, can 44 really be counted as 2 fours ??, i mean theres no operation relating 44 and 2 fours, not really sure about it

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# what makes 10 only using 4

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