Multiples
Name three multiples of 6.
6, 12, 18, and many more.
Name two factors of 20.
2, 10 (among others)
Is 17 prime or composite?
prime
What rule helps you check divisibility by 2?
Last digit is an even number
What’s the difference between a factor and a multiple?
Factor divides a number; multiple is a product of the number.
What is the least common multiple of 8 and 12?
24
What are all the factors of 36?
1, 2, 3, 4, 6, 9, 12, 18, 36
What is the smallest prime number?
2
How do you check divisibility by 3?
Sum of digits divisible by 3
True or False: Every prime number is odd.
False, 2 is a prime number.
Is 45 a multiple of 9?
Yes.
Which number has more factors: 24 or 30?
30
Is 51 prime or composite?
Composite - (3 X 17)
Is 234 divisible by 9?
Yes (sum of digits = 9)
What is the smallest common multiple of 6 and 8?
24
Find the first five multiples of 15.
15, 30, 45, 60, 75
What is the greatest common factor of 42 and 56?
14
Name all prime numbers between 30 and 50.
31, 37, 41, 43, 47
Explain why 135 is divisible by 5.
Last digit is 5.
Which has more factors: 100 or 120?
120
What is the least common multiple of 9, 12, and 15?
180
When you factorize 72, what are two prime factors?
2, 3
What is the largest prime less than 100?
97
Is 672 divisible by 12?
Yes (divisible by 3 and 4)
Challenge: Find the prime factorization of 210.