202 Multifaceted Number ConceptsPrime and Composite Numbers................................................................
CONCEPT:
What are Prime and Composite Numbers?
Prime numbers have exactly two factors. These factors are
1 and the number itself. For example, 2 is a prime number
because its only factors are 1 and 2. Composite numbers
have more than two factors. For example, 12 is a composite
number because it is divisible by 1, 2, 3, 4, 6, and 12. One
is not considered a prime number or a composite number.
Prime factorization involves renaming a composite number
as a product of prime numbers.CCSS
Operations and Algebraic ThinkingFormative Assessment
To fi nd out if a student understands prime and composite
numbers ask the students to use factor trees to show the
prime factorization of the following numbers:
12 24 32 100
If the students are unfamiliar with factor trees, display the
factor tree for 12 and ask them to explain the relationships
they see within the factor tree as a springboard for making
their own factor trees.