## Chapter 9:
 Tens Digit 3-Digit Number 10 ones = 1 ten estimate regroup round 10 tens = 1 hundred 1 hundred = 10 tens 10 pennies = 1 dime 10 dimes = 1 dollar

Chapter 9 Topics
 Add Hundreds, Tens, and Ones Count On 1, 10, and 100 Add:  Regroup Ones as Tens Regroup Tens as Hundreds Using Models Add:  Regroup Tens as Hundreds Draw Pictures to Add Add:  Regroup Twice Using Models to Add Add Money:  No Regrouping Add Money:  Regroup Dimes or Pennies Add Money:  Regroup Twice Subtract Hundreds, Tens, and Ones Count Back 1, 10, and 100 Subtract: Regroup Tens as Ones Regroup Hundreds as Tens Using Models Draw Pictures to Subtract Subtract:  Regroup Hundreds as Tens Subtract:  Regroup Twice Add to Check Subtraction Subtract Money:  Regroup Dollars or Dimes Subtract Money:  Regroup Twice Problem Solving Strategy:  Applications:  Mixed Strategies STANDARDS FOR MATHEMATICAL PRACTICE THAT WE WORK ON CONTINUOUSLY THROUGHOUT THE YEAR ARE AS FOLLOWS:

1.   Make sense of problems and persevere in solving them
2. Reason abstractly and quantitatively.
3. Construct viable arguments and critique the reasoning of others.
4. Model with mathematics.
5. Use appropriate tools strategically.
6. Attend to precision.
7. Look for and make use of structure.
8. Look for and express regularity in repeated reasoning.