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Answer
If the sum of the digits is divisible by nine, so is the number.
Add up all of the digits in the number and see if the sum is divisible by 9. If you still can't tell, you can add those digits again to see if the new sum is divisible by 9. You can keep going until you the sum is obviously divisible by 9 or not.
For example, is 486451464 divisible by 9?
Do 4 + 8 + 6 + 4 + 5 + 1 + 4 + 6 + 4 = 42.
Is 42 divisible by 9? Not sure, you can then do:
4 + 2 = 6. Which clearly isn't divisible by 9. So our original number, 486451464, isn't either.
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Puzzle 670
Using only horizontal and vertical lines, connect every number to its pair (1 goes to 1, 2 goes to 2, etc). The lines must not cross each other.
Note: this puzzle is not interactive, and the squares cannot be clicked.
My first is in kendo, but not in squash.
My second is in hurdles, and in hunting.
My third is in bowman, and in bowling.
My fourth is in cycling, and in golf.
My fifth is in flying, and not in swimming.
My last is in running, and not in dancing.
My whole is a sport.
Reasoning
The first letter can only be: D E K N O
The second letter can only be: H U
The third letter can only be: B N O W
The fourth letter can only be: G L
The fifth letter can only be: F L Y
The sixth letter can only be: R U