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Module 6 Using Equivalence and Place Value (May)

     This unit focuses on students adding and subtracting two-digit numbers within 100.  They will use place value models and strategies grounded in their understanding, relate concrete or representational strategies to a written model and explain the reasoning behind their solution strategies.   The students will be working on a variety of concrete, representational, and abstract models while solving one and two digit addition and subtraction problems.  
The students will be:
  • using concrete models or drawings to show a strategy based on place value.
  • adding a two-digit number to a one-digit number
  • adding a two-digit number to a multiple of ten.
  • adding a two-digit number to a two-digit number.
  • explaining the steps used to add.
  • mentally finding 10 more / less than a two-digit number.
  • mentally finding 1 more / less than a two-digit number.
  • Subtracting multiples of 10 form a multiple of 10. (80-20=?)
Essential Questions:
  1. How does a digit's position affect its value?
  2. When might linking cubes be more helpful that base ten blocks for adding or subtraction 2-digit numbers?
  3. In what ways can numbers be composed and decomposed?
  4. How is knowledge of place value important to solving problems?
  5. How can explaining your answer to others help you become a better problem solver?
  6. What can you learn from solving problems in more than one way
  7. What are "landmark" or friendly numbers and why are they important? 
Home Activities:
  • Practice counting up by 10's and backwards by 10's.
  • Practice counting up and backward (by 1's) from different numbers. (Example: 75, 76, 77, 78 ....75, 74, 73, 72) 
  • Counting mixed sets with 10's and 1"s 
  • Build or draw addition and subtraction problems using base ten models (tens and ones)
  • Add and subtract together 
  • Explain how they found an answer to a problem.
  • Play games that allow them to add or subtract such as card games or dice games.
  • Look for numbers while riding in the car that are 1 or 10 more or less than a starting number.
Jan Troyer,
Apr 22, 2015, 6:32 AM