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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

24

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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

2. 85 + 12

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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

2. 85 + 12

97

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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

2. 85 + 12

3. 114 –  29

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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

2. 85 + 12

3. 114 –  29

85

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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

2. 85 + 12

3. 114 –  29

4. 8 x 47

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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

2. 85 + 12

3. 114 –  29

4. 8 x 47

376

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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

2. 85 + 12

3. 114 –  29

4. 8 x 47

5. 72  4

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Pre-Algebra Lesson 1.1

Find the value of each expression.

1. 18 + 6

2. 85 + 12

3. 114 –  29

4. 8 x 47

5. 72  4

18

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Pre-Algebra Lesson 1.1

Find the value of each expression.

6. The sales figures for a business for the firstquarter months were as follows.

January $12,000

February $15,000

March $10,000

What were total sales for the first quarter?

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Pre-Algebra Lesson 1.1

Find the value of each expression.

6. The sales figures for a business for the firstquarter months were as follows.

January $12,000

February $15,000

March $10,000

What were total sales for the first quarter?

$37,000

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

1. Explore

Read the problem carefully.

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

1. Explore

•Read the problem carefully.•Ask yourself questions like “What

facts do I know” and “What do

I need to find out?” 

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

2. Plan

•See how the facts relate to each other.

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

2. Plan

•See how the facts relate to each other.•Make a plan for solving the problem.

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

2. Plan

•See how the facts relate to each other.•Make a plan for solving the problem.

•Estimate the answer.

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

3. Solve

•Use your plan to solve the problem.

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

3. Solve

•Use your plan to solve the problem.•If your plan does not work, revise it

or make a new plan.

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

4. Examine

•Reread the problem.

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

4. Examine

•Reread the problem.•Ask, “Is my answer close to my

estimate?” 

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

4. Examine

•Reread the problem.•Ask, “Is my answer close to my

estimate?” 

•Ask, “Does my answer make sense 

for the problem?” 

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Problem-Solving strategy:

Make a PlanThe Four-Step Problem Solving Plan

4. Examine

•If not, solve the problem another way.

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Application

How long would it take to count to

one million if it takes one second to

say each number.