Factor Basics
List all of the factors of 42.
1, 2, 3, 6, 7, 14, 21, and 42
Is 15 a multiple of 3? Explain.
Yes. 3,6,9,12,15
Is 9 prime or composite? Explain why.
Composite. 1 x 9, 3 x 3
What is one factor pair of 12?
(1,12), (2,6), or (3,4)
True or False: All multiples of 5 end in 0 or 5.
True
List all the factors of 18.
1, 2, 3, 6, 9, 18
Write the first 4 multiples of 6.
6, 12, 18, 24
Name one prime number between 10 and 20.
11, 13, 17, or 19
Complete the factor pair: ___ × 5 = 30
Find a number that has more than 4 factors.
Accept possible answers.
How many factors does the number 10 have?
1,2,5,10 (4 factors)
Which number is a multiple of both 2 and 5:
12, 15, or 18
None
How many factors does a prime number have?
2
How many factor pairs does 16 have?
3 (1×16, 2×8, 4×4)
True or False. If a number is even, it is a multiple of 4.
False. 14 is even and not a multiple of 4.
Which number has more factors: 12 or 13? Explain why.
12-It is composite. 13-only 2, it is prime.
What is the smallest multiple of 8 that is greater than 30?
32
Why is the number 1 not prime?
Draw or describe an array for 18 using factor pairs.
3 rows of 6, 2 rows of 9, etc.
Brooklyn says factors and multiples are related. Use the equation 8 x 5 = 40 to describe the relationship between factors and multiples.
8 and 5 are factors of 40. 40 is a multiple of 8 and a multiple of 5.
A number has exactly two factors. What kind of number is it?
Prime Number
Explain how you know if a number is a multiple of 4.
If the last two digits are divisible by 4
Which number is composite AND even: 17, 21, 24? Explain.
24 (more than 2 factors and even)
Which number has more factor pairs: 18 or 20? Explain.
They have the same.
Brendan says all even numbers less than 20 are composite. Find an even number less than 20 that is NOT composite. Explain.
2 is prime. It only has 2 factors. 1 x 2