Math Vocabulary ReviewYou Can Do It!

What is a prime number?

A number that has only itself and one as its factors.

Which of the following numerals is a prime number?

A) 7

B) 18

C) 20

D)31

What is a composite number?

A number that has more than one and itself as factors.

Which of these numerals are composite?

A) 22

B) 17

C) 34

D) 1,000

A numerator is…

The top number in a fraction.

What are the numerators in the following fractions?

A) 7/8

B) 9/10

C) 6/7

A denominator is…

The bottom number in a fraction.

Which numbers in the following fractions are denominators?

A) 2/8

B) 4/5

C) 3/7

What is the difference between the GCF and the LCM?

GCF: the greatest common factor

LCM: the least common multiple

Examples of the LCM:

8 and 6 share a LCM of 24

12 and 10 share a LCM of 60

Examples of the GCF:

12 and 20 share the factors of 2 and 4

16 and 40 share the factors of 2, 4, and 8

What is an equivalent fraction?

An equivalent fraction refers to the same, or equal amounts of fractions. When we compare them, they are the same, regardless of the difference in the denominator.

Examples could be:

½=2/4=3/6=4/8=5/10=6/12=7/14=8/16

To make an equivalent fraction, multiply the numerator and denominator by the same number.

For example, to change 2/3 into an equivalent fraction, multiply 2 by 2 and 3 by 2, to get 4/6.

What is a reciprocal fraction?

It is the opposite (think flipped) fraction.

For example, the reciprocal of 2/3 is 3/2.

Can you make the reciprocal fraction for the following numbers?

A) 7

B) 5/6

C) 8/9

D) 121

What is an improper fraction?

An improper fraction is when the numerator is larger than the denominator.

Can you change these fractions into improper fractions?

A) 7 ½

B) 18 ¾

C) 20 2/3

Who can tell me what a mixed number is?

A mixed number is a whole number and a fraction.

Can you change these improper fractions into mixed numbers?

A) 7/2

B) 81/5

C) 26/3

D) 33/4

A simplified or reduced fraction…

Refers to REDUCING the fraction to its lowest possible form.

To reduce a fraction, you must have a common factor between the numerator and denominator in order to reduce it.

For example, 6/8 can be reduced by dividing both 6 and 8 by 2. Our reduced fraction would be ¾.