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Problem Solving Strategies: Story Problems Addition and Subtraction

Problem Solving Strategies: Story Problems Addition and Subtraction. Standard 2.2: Computation and Estimation A. Solve addition and subtraction in everyday situations using concrete objects with one or two digit numbers. Standard 2.5: Mathematical Problem Solving and Communication

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Problem Solving Strategies: Story Problems Addition and Subtraction

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  1. Problem Solving Strategies: Story ProblemsAddition and Subtraction Standard 2.2: Computation and Estimation A. Solve addition and subtraction in everyday situations using concrete objects with one or two digit numbers. Standard 2.5: Mathematical Problem Solving and Communication A. Use appropriate problem solving strategies.

  2. STEP ONE • Read the word problem and identify the important information you will need to solve the problem.

  3. STEP TWO • Identify if you will need to do addition or subtraction to solve the problem.

  4. Addition • Addition story problems often use key words like: • In all • More than • Combined • altogether • Total of • Sum • Added to EXAMPLE: Jane has 5 Barbie's and for her birthday she gets 3 more. How many Barbie’s does Jane have altogether? (5+3=?)

  5. Subtraction • Subtraction story problems often use key words like: • Have left • Minus • Difference • Less than • Fewer than • Take away • Gave/give away EXAMPLE: I had 7 lollipops and I gave away 4 to my friends. How many do I have left? (7-4=?)

  6. STEP THREE • Solve the problem using one of the many problem solving strategies: • Drawings and illustrations • Making an equation • Making a table • Use your own strategy

  7. DRAWINGS AND ILLUSTRATIONS Drawing a picture is a great way to solve word problems. You not only get the answer but it is easy to see WHY you get the answer. A good example of a problem you would want to make a drawing for would be a problem like: For Stacie's birthday she got a bag of marbles from her friend Amy. The bag has 6 red marbles, 10 blue marbles, 4 yellow marbles, and 1 green marble. How many marbles does she have in her bag? • What you are trying to find out: How many marbles are there in the bag? • Make a plan: Draw out each set of marbles and count them up. • There are a total of 21 marbles!

  8. MAKE AN EQUATION Making an equation for story problems is also a great way to solve story problems. You just take the numbers from the problem and turn them into an equation. This problem would be a good example of when to use an equation: Joey has 5 pencils, Sue has 3 pencils, and Bobby has 5 pencils. How many pencils do they have all together? • Decide what you are trying to find out: How many pencils there are all together. • Make a plan or in this case an equation. We know that Joey had 5 pencils, Sue had 3 pencils, and Bobby had 5 pencils. 5+3+5= 13 pencils all together

  9. MAKE A TABLE Making a table is a very organized and simple way to solve some story problems. It is best used when dealing with problems like: Andy and his parents decided that for his allowance would go up one dollar every week for 3 consecutive weeks. If he starts out at getting 2 dollars how much would he make by week 5? • Find: What will his allowance be week 5? • Plan: Make a chart of what his allowance will be each week  Week $ allowance 1 $2.00 2 $3.00 3 $4.00 4 $ 5.00 5 $6.00 ANSWER- $6.00

  10. STEP FOUR • Writing your answer to the story problem is the final step • When writing the answer there are a few things you have to remember • What are you trying to find? • Your answer should be in units such as (mph, cups, or inches). • Your answer should be in a complete sentence. Examples

  11. EXAMPLES TO ANSWERS If Keri has 3 apples and 5 oranges how many more oranges does she have than apples? Wrong way to Answer this Story Problem: • 2 (it is the right answer but when working with story problems you have to explain your answer) Right Way to Answer this Story Problem: • Keri has 2 more oranges than apples.

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