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Definition of algorithm
a procedure or specific set of steps that will lead to consistent results
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Mental Arithmetic
- 1. use it
- 2. when to use it
- 3. why it works the way it does
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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
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Problem Solving
- 1. teacher directed discovery
- 2. manipulatives has place value characteristics
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Story Problem Using Subtraction Questions
- 1. Tell Story
- 2. Ask how can we solve this problem
- 3. What number sentence (helps interpret story)
- 4. Using your manipulatives, please show me the 66.
- 5. How many ones are in 66? 66. How can I subtract 7 ones? trade/break apart a 10 for 10 ones7. How many ones do I have now? 168. Now, subtract 7 ones.
- 9. How ones do you have now? 910. Now, subtract 2 tens.
- 11. How many tens do you have? 312. What is the answer to the story problem? 39
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Story Problem Using Addition Questions
- 1. Tell Story
- 2. Ask how can we solve this problem
- 3. What number sentence (helps interpret story)
- 4. Using your manipulatives, please show me the 66.
- 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? no9. Make a trade and place the ten above the other ten.
- 10. Combine your tens.
- 11. How many tens? 312. How many are there now? 33
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