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Multiplication

Word Problems

Lesson 1.7

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Learning Targets

  • I can accurately solve a multi-digit multiplication problem within a word problem.
  • I understand and can explain why the solution strategies work based on place value and properties of operations.

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Vocabulary

  • Word Problem

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What is a word problem?

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A word problem is a mathematical exercise that is in the form of a real-life situation. This type of problem always has a question that needs to be solved.

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Solving Word Problems

Here is an example of a word problem - what strategies might you use to solve it?

Problem #1

A truck has 50 boxes of jump ropes.

Each box contains 100 jump ropes.

How many jump ropes are on the truck?

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Multiplication Word Problem Video

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Steps to solving a word problem

  1. Read the problem
  2. Identify important information (numbers and units)
  3. Determine what the question is asking
  4. Write an equation that represents the problem
  5. Solve the equation

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Example #1

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Solving a Word Problem: Example #1

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Step 1. Read the problem

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A truck has 50 boxes of jump ropes.

Each box contains 100 jump ropes.

How many jump ropes are on the truck?

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Solving a Word Problem: Example #1

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Step 2. Identify important information (numbers and units)

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A truck has 50 boxes of jump ropes.

Each box contains 100 jump ropes.

How many jump ropes are on the truck?

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Solving a Word Problem: Example #1

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Step 3. Determine what the question is asking

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A truck has 50 boxes of jump ropes.

Each box contains 100 jump ropes.

How many jump ropes are on the truck?

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Solving a Word Problem: Example #1

Step 4. Write an equation

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A truck has 50 boxes of jump ropes.

Each box contains 100 jump ropes.

How many jump ropes are on the truck?

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50 boxes multiplied by 100 jump ropes = ?

50 x 100 = ?

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Solving a Word Problem: Example #1

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Step 5. Solve the equation

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A truck has 50 boxes of jump ropes.

Each box contains 100 jump ropes.

How many jump ropes are on the truck?

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50 boxes multiplied by 100 jump ropes = ?

50 x 100 = 5000 jump ropes are on the truck

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Example #2

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Solving a Word Problem: Example #2

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Step 1. Read the problem

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Charles went to a garage sale to buy chairs.

Each chair cost 15 dollars.

How much money did Charles spend for the 12 chairs he bought?

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Solving a Word Problem: Example #2

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Step 2. Identify important information (numbers and units)

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Charles went to a garage sale to buy chairs.

Each chair cost 15 dollars.

How much money did Charles spend for the 12 chairs he bought?

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Solving a Word Problem: Example #2

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Step 3. Determine what the question is asking

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Charles went to a garage sale to buy chairs.

Each chair cost 15 dollars.

How much money did Charles spend for the 12 chairs he bought?

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Solving a Word Problem: Example #2

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Step 4. Write an equation

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Charles went to a garage sale to buy chairs.

Each chair cost 15 dollars.

How much money did Charles spend for the 12 chairs he bought?

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1 chair = $15

12 chairs multiplied by $15

12 x 15 = ?

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Solving a Word Problem: Example #2

Step 5. Solve the equation

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Charles went to a garage sale to buy chairs.

Each chair cost 15 dollars.

How much money did Charles spend for the 12 chairs he bought?

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1 chair = $15

12 chairs multiplied by $15

12 x 15 = $180

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Review

Word Problem: a mathematical exercise that is in the form of a real-life situation. This type of problem always has a “question” that needs to be solved.

How to Solve a Word Problem

  1. Read the problem
  2. Identify important information (numbers and units)
  3. Determine what the question is asking
  4. Write an equation that represents the problem
  5. Solve the equation

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Khan Academy Practice Activities

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This presentation from Grade 4 Math by MN Partnership for Collaborative Curriculum is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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