The 11 Test!



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Here's how to tell when a number up to 1,000 divides exactly by 11.
 If it's a 2 digit number, the digits will be the same. (E.g.33 or 77)
 If it's a 3 digit number: add the two outside digits and take away the middle digit.
If the answer is 0 or 11 then the number will divide by 11.
Examples:
451: 4+15 =0 so 451 will divide by 11.
869: 8+96=11 so 869 will divide by 11.
The PRIME COUNTER
Testing for 11, 7 or 13
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