The Count was right in Sesame Street when he said " This Universe is being brought to you by the number 3!!!". Here are 3 things that are all you need to know about numbers including Primes. For you excitable types, that have been driven dippy about Primes read 2 first!!!
1. Numbers ending in 2, 4, 6, 8 in the far right column ( 22, 34, 56, 48, etc. ) are all divisible by 2.
2. Numbers ending in 1, 3, 7, 9 in the far right column ( 11, 21,13, 33, 17, 27, 19, 49 ) may or may not be divisible by numbers ending in 1, 3, 7, 9. If they are not divisible by numbers ending in 1, 3, 7, 9 in the far right column they are Prime Numbers, which are only divisible by themselves and 1.
3. Numbers ending in 0 and 5 in the far right column ( 30, 40, 35, 45, etc. ) are always divisible by 5.
No comments:
Post a Comment