Question

using the number 4 four times, come up with the answer 13 using addition, subtraction, multiplication, or square roots.

Answer 1

no division?

Answer 2

yes, you can use division...sorry

Answer 3

only use 4 four times?

Answer 4

yes

Answer 5

can't use any other numbers

Answer 6

can you use the #44?

Answer 7

no...only 4 fours.

Answer 8

the only way i can think to do it is ..

\[\frac{4+4!+4!}{4}\]

Answer 9

Sorry, what does the ! stand for?

Answer 10

factorial .. 4! = 4*3*2*1 = 24

Answer 11

no, I doubt that's it. my son's only a seventh grader and hasn't used factorials yet.

Answer 12

i can only do it that way or using 44

Answer 13

okay, well, let's try the number 44. How do you go about that?

Answer 14

\[\frac{44}{4} + \sqrt{4}\]

Answer 15

thanks sweetie, how about trying the same thing with the number 11 now?

Answer 16

\[\frac{44}{\sqrt{4}+\sqrt{4}}\]

Answer 17

oh, you are so great! Thank you, dear. You just helped us out a great deal.

Answer 18

anytime.