Unit 2 Addition and Subtraction
Objectives:
Chapter 1- Mental Calculation:
*Review mental addition of ones or tens.
*Add numbers within 100 by making tens.
*Add numbers within 100 by adding first the tens and then the ones.
*Add numbers close to tens.
*Review mental subtraction of ones and tens.
*Subtract numbers within 100 by subtracting first the tens and then the ones.
*Subtract a number close to tens.
*Add or subtract a number close to 100.
*Add more than 2 numbers within 10,000.
Chapter 2-Sum and Difference
*Understand the terms sum and difference.
*Draw part-whole models to represent mathematical statements.
*Choosing between the two models for correct representation.
*Use the symbol "+" for "sum" and "-" for "difference".
*Use the symbol ">" for "greater than" and "
Chapter 3-Estimation
*Review rounding.
*Check for reasonable answer using estimation.
Chapter 4-Word Problems
*Use modeling to solve one-step word problems involving addition and subtraction.
*Use modeling to solve two-step word problems involving addition and subtraction with the steps needed.
*Practice 1-step word problems and 2-step word problems with steps needed given.
Chapter 5-Adding Ones, Tens, Hundreds, and Thousands
*Review of addition of numbers up to 3 digits.
*Adding thousands with another number up to 4 digits with renaming once.
*Add 3-digit or 4-digit numbers where renaming occurs more than once.
Chapter 6-Subtracting Ones, Tens, Hundreds and Thousands
*Review of subtraction of numbers up to 3 digits.
*Subtracting thousands with another number up to 4-digits with renaming twice.
*Subtracting thousands with another number up to 4-digits with renaming up to four times.
*Subtracting from a whole thousand with renaming over several places.
*Practice estimation for reasonable answers.
*Practice addition and subtraction with renaming.
*Practice 1-step word problems.
*Practice 2-step word problems.
Chapter 7-Two-step Word Problems
*Solve two-step word problems where students have to determine intermediate step on their own.
*Practice 2-step word problems.