4th Grade Math Review

Front

What is a factor?

Back

A factor is a number that divides another number without leaving a remainder. For example, 4 is a factor of 20 because 20 ÷ 4 = 5.

Front

How do you divide a number among friends?

Back

To divide a number among friends, you take the total number and divide it by the number of friends. For example, 56 cards shared by 4 friends means each friend gets 56 ÷ 4 = 14 cards.

Front

What is an equivalent fraction?

Back

An equivalent fraction is a fraction that represents the same value as another fraction. For example, 82/100 is equivalent to 0.82.

Front

How do you find how many times one number is compared to another?

Back

To find how many times one number is compared to another, divide the larger number by the smaller number. For example, if Bill made 45 cupcakes and Oliver made 5, then 45 ÷ 5 = 9.

Front

What is a prime number?

Back

A prime number is a number greater than 1 that has no positive divisors other than 1 and itself. For example, 2 is a prime number.

Front

What is the process of finding factors of a number?

Back

To find factors of a number, list all the whole numbers that can divide that number without leaving a remainder. For example, the factors of 20 are 1, 2, 4, 5, 10, and 20.

Front

How do you convert a decimal to a fraction?

Back

To convert a decimal to a fraction, write the decimal over 1 and multiply the numerator and denominator by 10 for each digit after the decimal point. For example, 0.82 = 82/100.

Front

What does it mean to share equally?

Back

To share equally means to divide something into parts that are the same size. For example, if 56 cards are shared equally among 4 friends, each friend gets the same number of cards.

Front

What is the relationship between multiplication and division?

Back

Multiplication and division are inverse operations. If you multiply two numbers, you can find one of the numbers by dividing the product by the other number.

Front

How do you identify a prime number from a list?

Back

To identify a prime number from a list, check if the number has only two factors: 1 and itself. For example, from the list 1, 10, 2, and 15, only 2 is prime.