They were discovered, not invented.
The divisibility rules for a prime number is if it is ONLY divisible by 1, and itself.
Oh honey, divisibility rules have been around longer than your grandma's secret meatloaf recipe. But if you want a name to drop at your next trivia night, credit goes to good ol' Euclid. He's the OG mathematician who laid down the law on how numbers can play nice and divide evenly.
12
You can always check on the divisibility of a number by dividing it into another number. But if you know the divisibility rules, you can get that information easier and faster.
i think divisibility rules help with fractions because it helps you reduce the fraction to make i a simple fraction.
Three
3 and 9. And they divide into 123456789 whether or not you use divisibility rules!
bogo mo!
The number 0.
Yes.
0.4557
0.4557