Unit 4, Section A

What Is Division?

Grade 3

Practice

Problem 1

3.OA.A.1

Pre-unit

Write a multiplication expression that represents the array.
Write a multiplication equation that represents the array.

Problem 2

3.MD.C.7

Pre-unit

Find the area of each rectangle.

A rectangle. Left side labeled 4 centimeters. Top labeled 10 centimeters. Other sides unlabeled. — B

Problem 3

3.MD.C.7

Pre-unit

The area of the rectangle is 40 square centimeters.

Find the unknown side length of the rectangle. Explain your reasoning.

A rectangle. Left side labeled 5 centimeters. Top labeled question mark. Other sides unlabeled.

Problem 4

Pre-unit

Find the number that makes each equation true.

\(8 \times 5 = \underline{\hspace{1cm}}\)
\(5 \times \underline{\hspace{1cm}} = 35\)
\( \underline{\hspace{1cm}} \times 2 = 18\)

Problem 5

Pre-unit

There are 6 volleyball teams in the gym. Each team has 10 players. How many volleyball players are there altogether?

Make a drawing to represent the situation.
Write an equation with a symbol for the unknown that represents the situation.
Solve the problem.

Problem 6

ForLesson 1: How Many Groups?

For each problem, show your thinking using a drawing or a diagram.

There are 40 apples packed into boxes. There are 8 apples in each box. How many boxes are there?
There are 40 apples packed into boxes. There are 10 apples in each box. How many boxes are there?

Problem 7

ForLesson 2: How Many in Each Group?

For each problem, show your thinking using a drawing or a diagram.

There are 30 oranges. They are packed into 5 bags with the same number of oranges in each bag. How many oranges are in each bag?
There are 30 oranges. They are packed into 3 bags with the same number of oranges in each bag. How many oranges are in each bag?

Problem 8

ForLesson 3: Division Situation Drawings

Ten people go to the movies in cars. Two people go in each car. How many cars are there? Show your thinking using a drawing or a diagram.
Ten other people go to the movies in cars. They ride in 2 cars with the same number of people in each car. How many people are in each car? Show your thinking using a drawing or diagram.
How are the 2 situations similar? How are they different? How are the diagrams similar? How are they different?

Problem 9

ForLesson 4: Interpret Division Expressions

There are 20 desks in the class. They are divided equally into 5 groups. How many desks are in each group?

Which expression best represents this situation: \(20\div4\) or \(20\div5\)? Explain your reasoning.
Choose the diagram that represents this situation. Explain your reasoning.

A

B

Problem 10

ForLesson 5: Write Division Expressions

Mai’s family picked 40 peaches. They put 5 peaches in each bag.

Write a division expression that represents the situation.
How many bags of peaches did Mai’s family pick? Explain or show your reasoning.

Problem 11

Exploration

Complete each problem by putting a number in each blank that makes sense. Draw a diagram to represent and solve each problem.

Mai has __________ stickers. She puts the same number of stickers on each of her 5 notebooks. How many stickers are on each notebook?
Andre has __________ cards. He arranges them in rows of __________ cards each. How many rows of cards does Andre make?

Problem 12

Exploration

Write a division situation to match each diagram.

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What Is Division?

Practice

Problem 1

Problem 2

Problem 3

Problem 4

Problem 5

Problem 6

Problem 7

Problem 8

Problem 9

Problem 10

Problem 11

Problem 12