Question

Is the number 15 prime or composite?





A.
prime


B.
composite

Answer 1

can you factor 15 as a product of two other numbers ?

Answer 2

umm i dont think so

Answer 3

Divide it by 3

Answer 4

hold on..

Answer 5

$$\Huge 15 \div 3= ?$$

Answer 6

ok i got it its composite!

Answer 7

multiplication table (memorizing it) comes in handy here
if the number is an answer to any product i.e. if it appears anywhere in the multiplication table then it is composite

Answer 8

Good job :)

Answer 9

thank you guys so much! :)

Answer 10

Thanks for asking!

Answer 11

You can find the positive factors of a given positive integer by dividing it by positive integers in order.