Multiples
True or false: 20 is a multiple of 5
True! 5, 10, 15, 20
OR
5x4=20
What is one factor pair of 16?
1x16
2x8
4x4
True or false: 2 is a prime number.
True! The only factor pair of 2 is 1x2
True or false: 22 is composite.
True
True or false: 80 is a multiple of 4
True! 4x20=80
True of false: 16 is a factor of 8.
True or false: 8 is prime.
False! 8 has more than 1 factor pair.
True or false: all odd numbers are prime.
False!! There are many odd numbers that are not prime like 21 or 27.
True or false: 5 is a multiple 10
FALSE! The multiple of 10 are 10, 20, 30, 40...
True or false: The only factor pair of 17 is 1 and 17.
True! 17 is prime!
True or false: 27 is prime.
False! 27 has more than one factor pair. 1x27 and 3x9
True or false: 30 is a composite number.
True
Han is playing a card game with friends. The number of cards never changes, but the number of players does. The cards can be divided equally between 3 players. Could there be 18 cards?
Yes because 18 is a multiple of 3
3, 6, 9, 12, 15, 18
OR
3x6 (each person would get 6 cards)
List out the factor pairs of 12.
1x12
2x6
3x4
Why is 29 a prime number?
29 only has one factor pair.
Why is 15 a composite number?
15 has multiple factor pairs.
What are 3 multiples of 12?
24, 36, 48...
List all the factor pairs of 36.
1x36
2x18
3x12
4x9
6x6
True or false: 1 is a prime number.
False! All other prime numbers have a factor pair of the number and itself. 1 is the only factor. It's neither prime or composite!
Write 3 composite numbers.
Many answers!