Factors & Multiples
List the factors of 8
1, 2, 4, 8
What is the definition of a prime number and give an example.
Examples include: 2, 3, 5, 7, 11, ...
any number that only has two factors, 1 and itself as factors
Find the Greatest Common Factor of 12 and 8.
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 8: 1, 2, 4, 8
4 is the Greatest Common Factor!
fraction
What is my favorite thing to eat?
Sushi
List the first four multiples of 6.
6, 12, 18, 24
Find the prime factorization of 30.
2 x 3 x 5
Find the Least Common Multiple of 6 and 10.
Multiples of 6: 6, 12, 18, 24, 30, ...
Multiples of 10: 10, 20, 30, ...
30 is the Least Common Multiple!
Solve:
642 / 3 =
How many years have I taught at McDevitt?
8
List all the factors of 24.
1, 2, 3, 4, 6, 8, 12, 24
Find the prime factorization of 63.
3 x 3 x 7
Lin is putting stickers on some of the lockers. She puts a skateboard sticker on every 4th locker, and a soccer sticker on every 5th locker.
What locker will be the first to get both stickers?
Skateboard stickers: 4, 8, 12, 16, 20, ...
Soccer Stickers: 5, 10, 15, 20, ...
The first locker to get both will be locker 20
431 x 65
28,015
How many children do I have?
List the first five multiples of 10.
10, 20, 30, 40, 50
Find the prime factorization of 80.
2 x 2 x 2 x 2 x 5
During a show, students will be grouped together for their performances. There are 32 elementary students and 40 middle school students. The director wants identical groups, with students from both schools in each group.
What is the largest number of groups that can be formed?
Factors of 32: 1, 2, 4, 8, 16, 32
Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40
The largest number of groups that can be formed is 8
Name a pair of numbers that has a greatest common factor of 6.
Examples:
12 and 18
6 and 24
30 and 48
What elementary school did I go to? Hint: I grew up in Waltham too.
MacArthur
List all the factors of 56.
1, 2, 4, 7, 8, 14, 28, 56
Write the Prime Factorization of 36 using exponents (exponential form)
32 x 22
Find the GCF and LCM of 18 and 24
LCM: 72
18: 18, 36, 54, 72. 24: 24, 48, 72
GCF: 6
18: 1, 2, 3, 6, 9, 18
24: 1, 2, 3, 4, 6, 8, 12, 24
Use the clues below to find the mystery pair of numbers:
Clue 1: Both numbers are less than 20.
Clue 2: One number is even and the other number is odd.
Clue 3: The Greatest Common Factor of the two numbers is 3.
Clue 4: The Least Common Multiple of the two numbers is 36.
The numbers are 12 and 9
Name a teacher in 7th grade
Variation of answers