Multiples
List the first five multiples of 5.
5,10,15,20,25
List all the factors of 10.
1,2,5,10
Is 7 a prime number?
Yes
Is 4 a composite number?
Yes
What is a factor?
A number that divides another number exactly (no remainder).
What is the least common multiple (LCM) of 3 and 4?
12
List all the factors of 18.
1, 2, 3, 6, 9, 18
Is 9 a prime number?
No
Give one example of a composite number between 10 and 20.
12,14,15,16,18
What is a multiple?
The result of multiplying a number by an integer. Skip Counting
What is the LCM of 6 and 8?
24
What is the greatest common factor (GCF) of 12 and 16?
4
List all the prime numbers less than 15.
2,3,5,7,11, 13
What is the smallest composite number?
4
What is a prime number?
A number with exactly two factors: 1 and itself.
What is the LCM of 9, 12, and 15?
180
What is the GCF of 20, 30, and 50?
10
What is the only even prime number?
2
Name two consecutive composite numbers between 20 and 30.
24,25 or 25,26,
What is a composite number?
A number with more than two factors.
A traffic light flashes every 20 seconds, and another flashes every 30 seconds. How many seconds will pass before they flash together again?
60 Seconds
Find the GCF of 36, 48, and 60.
12
Write the prime factorization of 60.
2 × 2 × 3 × 5
A locker combination has the number 84. You realize 84 is a composite number. Explain how you know it’s composite, and give two numbers you could multiply to get 84.
84 is composite because it has more than two factors; for example, 6 × 14 = 84.
What is prime factorization?
Writing a number as a product of its prime factors.