word problems beth marengo jserra catholic high school math department
TRANSCRIPT
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WORD PROBLEMS
Beth Marengo
JSerra Catholic High School
Math Department
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Overview: 6 Step ProcessOverview: 6 Step Process Step 1: What does the problem ask you to
find? Step 2: Let Statement Step 3: What do you know? Step 4: Algebraic Equation and Solution Step 5: Check your answer Step 6: Write a Sentence
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Example Problem
A chemist has 10 milliliters of a solution that contains a 30% concentration of
acid. How many milliliters of pure acid must be added in order to increase the
concentration to 50% ?
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STEP 1: What does the problem
ask you to find?
A chemist has 10 milliliters of a solution that contains a 30% concentration of acid. How many milliliters of pure acid must be added in order to increase the concentration to 50% ?
The question is: What amount of pure acid should the chemist
add?
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Step 2: Let Statement
This is the step where you identify your variable. Your variable should always refer to the unknown amounts from Step 1.
Let x = amount of pure acid to be added.
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Step 3: What do you know? Students should do one of the following
Draw a picture Write a verbal equation
+ =Amount: 10 ml x ml 10 +x ml
Concentration: 30% 100% 50%
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Step 4: Equation/SolutionTake what you know from your picture/verbal
equation and transform into an algebraic equation
.30(10) + 1.00(x) = .50(10 + x) 3 + x = 5 + .5 x
.5x = 2 x = 4
+ =
10 ml (30%) x ml (100%) 10 +x ml (50%)
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Step 5:Check Answer
Ask the students, does your answer sound reasonable? For example if we had reached a negative
solution, this is not reasonable. You cannot add a negative amount of milliliters to increase concentration.
Students tend to overlook the fact that these are real life problems and require real life solutions.
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Step 6:Write Sentence
Put your answer into a complete sentence. This accomplishes two very important things.
Double checks that the answer is reasonable. Ensures that you answered the question being asked.
THE CHEMIST NEEDS TO ADD 4 MILLILITERS OF PURE ACID TO THE
SOLUTION.
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Thank You and Questions
ANY SUGGESTIONS? QUESTIONS?