Question

What the heck is this? explain @vinnv226
On a sheet of paper, draw the following sieve of eratosthenes and number all of the rows from 1 to 10. Like this:

http://curriculum.kcdistancelearning.com/courses/ALG1x-HS-A06/b/Exams/7Activity1/7Activity1_q1.gif
Which two rows have the greatest number of primes in them? Choose all that apply.

Answer 1

start by going through that list of numbers and crossing off all multiples of 2

then go back through the list and cross off all multiples of 3

then go back through the list and cross off all multiples of 5

etc etc

Answer 2

Do you know what a prime number is?

Answer 3

you'll find that a lot of this list will be eliminated, what's left will be prime numbers

Answer 4

it's probably explained better here

http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes

Answer 5

no, i have done forgot what prime is:(

Answer 6

a prime number is a number that only has 2 factors: 1 and itself

ex: 7 is a prime number since only 1 and 7 are factors

32 is not a prime number because 2 is a factor of 32

Answer 7

okay, so how do i tell which row has the most prime

Answer 8

did you follow that method? by crossing off all the multiples of 2, 3, 5, etc ?

Answer 9

yup

Answer 10

so you should see which row has the most primes

the primes will be the numbers that aren't crossed off

Answer 11

idk if i did it wrong but i think its either row 2 or 3, (the answer chooses are row 1-4)

Answer 12

ok one sec

Answer 13

I'm getting this

Answer 14

r u lost as I am lol

Answer 15

the primes are circled

Answer 16

so you thinking its 2?

Answer 17

rows 1 and 2 have 4 primes each which is the most of any other row

Answer 18

okay thank you sorry it took time to work with me

Answer 19

no worries and you're welcome