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Definition of algorithm
a procedure or specific set of steps that will lead to consistent results

Mental Arithmetic
 1. use it
 2. when to use it
 3. why it works the way it does

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

Problem Solving
 1. teacher directed discovery
 2. manipulatives has place value characteristics

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? 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

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? no
 9. Make a trade and place the ten above the other ten.
 10. Combine your tens.
 11. How many tens? 3
 12. How many are there now? 33

