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Q: Can you make 24 using only numbers 6 6 9 13?

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8 plus 1 , minus 5, plus 7 + 13

(6 x 13) - (6 x 9) = 78 - 54 = 24

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

Prime numbers are the numbers that can only be divided by 1 and them selves. As in 13 if you were to factor it using only whole numbers you would see that its factors are only 1 and 13. There for it is prime. While 12 you see that the factors are 1,2,3,4,6,12 meaning that it is not prime.You test several numbers, to see whether they are prime numbers, until you find a prime number.

Apart from itself and 1, the only numbers that divide evenly into 221 are 13 and 17. Therefore, 221 = 13 x 17.

Only 1 and 13, it's a prime.

I can find 13 ways, not just 7, to make 60 from adding numbers in the 4, 5 and 9 times tables.

You cannot! Answer dated: 13 January 2012

2 3 5 7 11 13 17 19 23 29

Easy! You do 1, 3, 5, 7, 9, 11, 13 etc.

13/954 = 0 with remainder 13.

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

Nothing goes into 13 equally. No 2 whole numbers multiplied together can make it. Only 6+7=13.

There are no two WHOLE NUMBERS that equal 13 besides the obvious 1 & 13.

13 is a prime number. Its only factors are 1 and 13.

Only 1 and 13; 13 is a prime number.

13 is a prime number, so the only 2 whole numbers that multiply to 13 are 13 and 1.

The only way I know how to do it is 12+13=25, 6 divided by 6=1, and 25-1=24

Using 1-6 can a magic triangle have a sum of 13

2, 3 and 13 are the only prime numbers that combine to make 78.

7-9=2 22 divide by 2=11 +13=24 boom im a legend

There is only one number that equals 13. That number is . . . . . 13.

11 and 13 are prime numbers because they have only 2 factors which are themselves and one.

6 2-digit numbers (13/15/35/53/51/31)

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