Multiples & Factors
List the first five multiples of 5.
5, 10, 15, 20, 25
What is the least common multiple of 4 and 6?
4: 4, 8, 12, 16, 20
6: 6, 12, 18, 24, 30
12!
Is 29 prime of composite? List its factor pairs to check.
prime; 1, 29
What would be the next three numbers in this pattern:
5, 10, 15, 20, ___, ___, ___
25, 30, 35
How do I know if a number is divisible by 2?
If the number is even/ the ones place ends in a 0, 2, 4, 6, or 8.
List all the factors of 20.
1, 2, 4, 5, 10, 20
What is the least common multiple of 4 and 10?
4: 4, 8, 12, 16, 20, 24
10: 10, 20, 30, 40, 50, 60
20!
Is 15 prime or composite? List its factor pairs to check.
Composite; 1, 3, 5, 15
What is the rule of this pattern?
5, 10, 20, 40, 80, 160
Multiply by 2
Is 41 divisible by 5?
No! It needs to end in a 5 or 0
What are these numbers multiples of?
21, 35, 49, 70, 84
Multiples of 7
What is the least common multiple of 50 and 100?
50: 50, 100, 150, 200, 250, 300
100: 100, 200, 300, 400, 500
200!
Is 1 prime or composite? List its factor pairs to check.
Neither!!!
What is the rule of this pattern?
3, 9, 27, 81
Multiply by 3
Is 84 divisible by 6?
Yes! 8+4=12, divisible by 3 and it is an even number so it is divisible by 2
Find the factors of 50.
1, 2, 5, 25, 10, 50
What is the greatest common factor of 50 and 100?
50: 1, 2, 5, 10, 25, 50
100: 1, 2, 4, 5, 10, 20, 25, 50, 100
50!
Is 67 prime or composite? List its factor pairs to check.
Prime; 1, 67
List the next three numbers in this pattern...
105, 90, 75, 60, ___, ___, ___
45, 30, 15
Is 567 divisible by 9?
Yes! 5+6+7= 18
18 is a multiple of 9
Which number is a factor of both 15 and 40?
5
What is the greatest common factor of 42 and 84?
42: 1, 2, 3, 6, 7, 14, 21, 42
84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
42!
Is 48 prime or composite? List its factor pairs to check.
Composite; 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
The pattern is add 16. Starting at 45 write the first 5 numbers of the pattern.
45, 61, 77, 93, 109
Is 649,043 divisible by 3?
No! The numbers add up to 26