Intro to Fractions

Intro to Multiplying Fractions or How I learned to stop worrying and began to rearrange left over pizza.

Pizza is all about fractions, if you can understand pizza, you can understand fractions.

Key Vocabulary

8 is a product of the factors 2 and 4 or the factors 8 and 1.

​factor: a number that divides another number (product).

Product: the result of two factors (or more) multiplying.

Multiple Choice

What number is the product of this problem.

2 x 4 = 8

• 2

• x

• 4

• 8

Multiple Choice

What number is not a factor of this problem.

2 x 4 = 8

• 2

• x

• 4

• 8

Key Vocabulary

4 x 2 = 8

Four times the number two will produce eight.

Multiplier: the number that is multiplying something.

Multiplicand: the number that is being multiplied.

Multiple Choice

What is the multiplier in the following story?

A box of candies comes with twenty-four candies. I bought eight boxes of candies for a total of one hundred and ninety-two candies.

• 24

• 8

• 192

Multiple Choice

What is the multiplicand in the following story?

A store sells boxes of Takis, each box has twelve bags of Takis. Ms. Cisneros bought fifteen boxes of Takis to treat her students. She has a total of one hundred and eighty bags of Takis to share.

• twelve

• fifteen

• one hundred and ninety-two

Key Vocabulary

Mr. Alaniz ate four eights of a pizza; he was very hungry.

Numerator: This is the total number of parts you are taking into account from a whole.

Denominator: This the total number of parts that make a whole.

Multiple Choice

What is the denominator of the following story?

If one classroom has twenty-six students and three students are absent, then the classroom would be twenty-three twenty-sixths full because three twenty-sixths of the students were absent.

• 26

• 3

• 23

Multiple Select

What are the numerators of the following story?

Fifth grade has five teachers. If one teacher is absent, then there would be four-fifths of the teachers present.

• 5

• 1

• 4

Key Vocabulary

Each pizza has eight slices, Ms. Zaher bought to pizzas and had 12 slices left over. She tried to fit the left-over slices into one box. The box has 12/8 of slices inside, that box is stuffed!

fraction greater than one: This happens when the numerator of a faction is greater than a denominator thus the fraction has a "hidden whole", also known as an improper fraction.

mixed number: A whole with a fraction or a whole with a decimal

Multiple Select

Solve the following:

Each classroom in the school has twenty-six students. A teacher was absent, and they split their students amongst the other teachers. Now the classrooms have thirty twenty-sixth of students! What fractions represent the number of students in each classroom?

• 26/30

• 30/26

• 1 and 4/26

• 1 and 26/30

Multiple Select

Solve the following:

Ms. Lewis bought twelve pizzas for a classroom party. Each pizza had eight slices. After the classroom party there were fourteen slices of pizza left. What is the fractions represent the amount of pizza left?

• 8/12

• 1 and 6/8

• 8/14

• 14/8