This one works best for very large number and it is one that I came up with myself. If you can split the number in half THREE times and the number is still even- it is a multiple of 16. Example- 32 32÷2=16 that's one 16÷2=8 that's two. 8÷2=4 that's the third time and it's still even! That means 32 is multiple of 16. Please note-The number ALWAYS has to start out even to be a multiple of any even number, that is because fractions can go till infinity, just like the largest number in the world.
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2.50
There is no divisibility rule for 13 because it is a prime number. If you are thinking: why is there a divsibility rule for 2 and 3 then. Well, i don't know so go look it up on google.
samyoora fiklan
It is 3 6 9
Just carry out the division.