Question

what are the prime numbers between 1 and 31

Answer 1

@nono266

Answer 2

Start to list numbers that are only divisible by themselves and 1 (think positive divisors).
So start at 2.
Is 2 prime? Are there any divisors of 2 besides 1 and 2?

Answer 3

no

Answer 4

No it doesn't have any other divisors so yes it is prime right?

Answer 5

oh ok

Answer 6

what about 3?

Answer 7

3 is prime too.

Answer 8

4?
5?
6?
and so on...

Answer 9

this is going to take a long time.

Answer 10

it isn't going to be that long

Answer 11

these are only small numbers between 1 and 31
we factor these in our head

Answer 12

Prime numbers list. List of prime numbers up to 100: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,

Answer 13

@luliannagonzales hope that helped :)

Answer 14

here is another way to do it
write out all the numbers between 1 and 31 including both 1 and 31
you are going to mark off all multiplies of 2 first (but don't mark off 2 since it is prime)