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To melv1489: 51 is not a prime number.?
Sorry, I dont know how to contact you
Ana
THIS IS NOT A QUESTION, ITS A MESSAGE TO SOMEONE. I AM A TEACHER OF MATHEMATICS, I KNOW THAT 51 IS NOT A PRIME. THANK YOU
ANA
4 Antworten
- vor 1 JahrzehntBeste Antwort
all u have to do is usually click there name but i am guessing u might know that lol
- Anonymvor 1 Jahrzehnt
3*17=51.
In fact it's easy to tell if a two digit number is not prime.
- If it ends in 0,2,4,6,8 then it's divisible by 2.
- If it ends in 0,5 then it's divisible by 5.
- If you sum its digits and that is divisible by 3, then your number is divisible by 3. In this case 5+1=6 is divisible by 3.
- Only three left to remember 49 = 7*7, 77 = 7*11 and 91= 7*13.
The rest are primes. Some people say that 91 is the number most often misquoted as a prime.
- Anonymvor 1 Jahrzehnt
51 is not a prime number, because 51 is divisible by 3 and 17....
- Anonymvor 1 Jahrzehnt
is not 3x17=51, not prime...not even grade A
