The students will be: using concrete models or drawings to show a strategy based on place value.
 adding a twodigit number to a onedigit number
 adding a twodigit number to a multiple of ten.
 adding a twodigit number to a twodigit number.
 explaining the steps used to add.
 mentally finding 10 more / less than a twodigit number.
 mentally finding 1 more / less than a twodigit number.
 Subtracting multiples of 10 form a multiple of 10. (8020=?)
 Essential Questions: How does a digit's position affect its value?
 When might linking cubes be more helpful that base ten blocks for adding or subtraction 2digit numbers?
 In what ways can numbers be composed and decomposed?
 How is knowledge of place value important to solving problems?
 How can explaining your answer to others help you become a better problem solver?
 What can you learn from solving problems in more than one way
 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.
