math

if one bus holds 20 people, how many bus will be needed to carry 400 people.

65+N=1096

N-10613 = 500

What are the factors of 12?

What are the factors of 100?

What are the set multiples of 3 between 20 - 50

What are prime number?

Which are the prime numbers : 23,4,5,6,7,8,9,11,13,21,19

What are the 3 common multiples of 3, 4, 6

From the set, write a set of prime numbers ( 41,57,91,10,19,111, 3,100,50)