Standard: 4.OA.B.4
Find all factor pairs for a whole number in the range 1–100. Recognize that a whole
number is a multiple of each of its factors. Determine whether a given whole
number in the range 1–100 is a multiple of a given one-digit number. Determine
whether a given whole number in the range 1–100 is prime or composite.
Math Practice Standards: 1, 2, 4, 5, 7
Task Exemplars:
Factor pairs
Part A:
Brad is playing with toy cars. He has 18 cars and wants to arrange them with the
same number of cars in each row. Draw a model to show all the ways he can
arrange the cars.
Part B:
What are the factors of the number 18?
Multiples:
Part A:
There are 6 eggs in a carton. Sally needs 24 eggs for her cookie recipe. Can she buy
exactly 24 eggs in packs of 6? Explain how you can use multiples to solve this
problem.
Part B:
What are the first five multiples of the number 6?
Prime and composite:
Part A:
Jenny has 23 rocks in her collection. Nate has 32 rocks in his collection. They are
learning about prime and composite numbers in school, and Jenny thinks they both
have a composite number, but Nate things they are both prime. Model and explain to
them how to determine if their collection is prime or composite.
Part B:
Is either of them correct in their thinking? Explain why or why not.
Part C:
Describe the difference between prime numbers and composite numbers.