4.OA Math Review

Front

What is a multiple?

Back

A multiple of a number is the product of that number and an integer. For example, multiples of 4 include 4, 8, 12, 16, etc.

Front

What is a prime number?

Back

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Front

How do you find the height of someone if you know their height is a multiple of another person's height?

Back

Multiply the height of the shorter person by the multiple. For example, if Danny is 5 feet tall and Jill is 4 times as tall, Jill's height is 5 x 4 = 20 feet.

Front

What are the factors of a number?

Back

Factors are numbers that can be multiplied together to get another number. For example, the factors of 27 are 1, 3, 9, and 27.

Front

How do you determine if a number is prime?

Back

Check if the number has only two factors: 1 and itself. If it has more than two factors, it is not prime.

Front

What is the equation to find how long it takes to do a task if you know it takes a certain time to do another task that is a multiple of it?

Back

Multiply the time taken for the first task by the multiple. For example, if it takes 6 minutes to fold laundry and washing dishes takes 3 times as long, it takes 6 x 3 = 18 minutes.

Front

What is the relationship between factors and multiples?

Back

Factors are numbers that divide another number evenly, while multiples are the result of multiplying a number by an integer.

Front

If a number is not prime, what can you say about its factors?

Back

If a number is not prime, it has more than two factors.

Front

What is the first multiple of any number?

Back

The first multiple of any number is the number itself.

Front

How can you list the first few multiples of a number?

Back

Multiply the number by 1, 2, 3, 4, etc. For example, the first few multiples of 4 are 4, 8, 12, 16.