# Chapter 7 Math Test 2. txt

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1. Definition of algorithm
a procedure or specific set of steps that will lead to consistent results
2. Mental Arithmetic
• 1. use it
• 2. when to use it
• 3. why it works the way it does
3. Substitution
• 1. hidden number strategy works because of the Make 10 Strategy
• 2. 298 + 167 = +2 then -2 from total
• 3. 35 - 18 = +2 then +2 from total
4. Problem Solving
• 1. teacher directed discovery
• 2. manipulatives has place value characteristics
5. Story Problem Using Subtraction Questions
• 1. Tell Story
• 2. Ask how can we solve this problem
• 3. What number sentence (helps interpret story)
• 5. How many ones are in 66? 6
• 6. How can I subtract 7 ones? trade/break apart a 10 for 10 ones
• 7. How many ones do I have now? 16
• 8. Now, subtract 7 ones.
• 9. How ones do you have now? 9
• 10. Now, subtract 2 tens.
• 11. How many tens do you have? 3
• 12. What is the answer to the story problem? 39
6. Story Problem Using Addition Questions
• 1. Tell Story
• 2. Ask how can we solve this problem
• 3. What number sentence (helps interpret story)
• 5. Push the number 66 toward the top of your page.
• 6. Build the 15 below the number 66.
• 7. Combine the ones.
• 8. Can all the ones stay together? no
• 9. Make a trade and place the ten above the other ten.