Q: How do you make 13 by using four fours?

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44 / 4 + root(4) is one solution. You can find additional solutions in the Wikipedia article "Four fours".

Only if you subtract three.

Three fours and one half of 4 Or if you mean using only fours and operation signs you develop methods like this: 42 - 4 + (4/4) = 13. In words, four squared (16) take 4 (12), + the sum of 4/4, which is one (13). Obviously, being an prime number, 13 doesn't fit equally into four, so use a combination of different mathematical symbols to change four into many other numbers: 42 = 16 Square Root of four = 2 4! (four factorial) = 24 43 = 64 4/4 = 1 4 + 4 = 8 Combinations of these can be used to make the 13 you're after.

44/4 + √4 = 11 + 2 = 13

(33 + 3!) / 3 = (33 + 6) / 3 = 39 / 3 = 13.

11 = 4/.4 +4/4 13 =( 4! radical( 4) + 4 )/4 13 = 4/,4/ + radical(4) + radical(4)

(.5x5)x5+.5=13

(22/2) + 2 = 11 + 2 = 13

1x36, 2x13, 4x9, 20+13. That's a few of them.

You don't say how many 6s I'm allowed to use, but here it is with four of them: 6 ÷ 6 + 6 + 6 = 13

what is four thirteenths of 13

22 + 9 - 20 + 13 = 24

4! - 44/4 = 24 - 11 = 13

2593 + 17 + 13 + 2

13

13

13 is the threshold age that should be to create an account. Children below 13 are not aware of the rules of using Gmail. Thus after 13 you can make an account.

(4x4)+(4/4)-4 The above uses five 4's. An answer, using factorials, and only four is: (4!+4-sqrt(4))/sqrt(4)

Count using base 13.

Using all 13 squares, and not counting different orientations, only one.

8

You get them rigged out using robotics. I did it with 6 of my 13. No kidding.(:

13 + 27 + 54 + 6 = 100.

There are 13 different ways to make 28 cents.

21 - 13 = 8... 9 - 6 = 3... 8 x 3 = 24

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