Math Detectives

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# Math Detectives - PowerPoint PPT Presentation

Math Detectives. Starring: Fourth Grade Students The Suspects: The Notorious Word Problems. The crime is. The “crimes” we will be solving are math crimes. We will be looking at word problems!. How do we solve the crime?. Read the entire word problem.

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## PowerPoint Slideshow about 'Math Detectives' - sidone

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Presentation Transcript
Math Detectives
• Starring:
• The Suspects:
• The Notorious Word Problems
The crime is...
• The “crimes” we will be solving are math crimes.
• We will be looking at word problems!
How do we solve the crime?
• Read the entire word problem.
• First we must figure out what we are looking for. What is the word problem asking us?
• Write a sentence to yourself.
Steps to Solving Word Problems
• UNDERSTAND
• PLAN
• Make a plan on how you will solve the problem. For example, will you add, subtract, multiply, or divide.
• SOLVE
• Use your plan and the information (clues) from the problem to answer the question.
• EXPLAIN
• How did you solve the problem? Use math detective words to say what you did.
The Crime...
• At a recent park clean-up, Jack picked up 30 pieces of trash. Emily picked up 25 and Annie picked up the most of all, 40! How many pieces of trash did the girls pick up all together?
Understand the problem

At a recent park clean-up, Jack picked up 30 pieces of trash. Emily picked up 25 and Annie picked up the most of all, 40! How many pieces of trash did the girls pick up all together?

• What are we trying to solve?
• What are our clues?

• How much trash did the GIRLS pick up?
• Emily picked up 25 pieces of trash
• Annie picked up 40 pieces of trash

Sometimes, word problems give you extra information!

Plan
• How can we solve this problem? How can we use the clues we have to find the answer?
• We can add the amount of trash Emily picked up to the amount of trash Annie picked up to find out how much trash the girls picked up.
• We don’t need to add the amount of trash Jack picked up because Jack is not a girl.
Solve
• Use your plan to solve the problem!

25 + 40 =

25 + 40= 65 pieces of

trash picked up

Explain

You have your answer. As a detective you must explain how you got it!

Use Math Detective words to explain (using sentences) what you did to find your answer.

Use the Detective Word list.

Math detective words

I added I used objects I guessed and checked

I subtracted I drew a picture I used logical reasoning

I multiplied I looked for a pattern I made an organized list

I divided I made a table I solved a simpler problem

I worked backwards

Continue with:

to find to see to figure out because

to get to show to determine since

End with:

Our Explanation
• I added the trash that Emily and Annie both picked up to find the sum. The sum is the amount of trash that both girls picked up. So my answer is 65 pieces of trash.
REcap
• When we solve math crimes we NEED to use four steps.
• Understand
• Plan
• Solve
• Explain
• Always explain your work using math detective words!
Problem #1
• Abby traveled to a wildlife park 55 miles from her home. She was excited because she saw so many different animals. The park had 6 giraffes, 4 lions, 8 ostriches, and 3 gigantic snakes. How many animals did Abby see all together?

Understand

Plan

Solve

Explain

Problem # 2
• Justin was getting ready to watch the Super Bowl. He saved \$35.00 for a Steeler’s jersey (#7). His mom gave him \$23.00 to buy a Steeler’s hat and his brother sent him \$7.00 for a Terrible Towel. How much money did Justin have to buy Steeler fan items?

Understand

Plan

Solve

Explain

Steps to Solving Word Problems
• UNDERSTAND