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Unit 2 Addition and Subtraction

Objectives:

Chapter 1-Meanings of Addition and Subtraction:

*Review the part-whole concepts of addition and subtraction.

*Use addition to find a whole, and subtraction to find a part.

*Compare the quantities in two sets using subtraction.

*Relate "more than" and  "less than" to addition and subtraction.

*Review addition and subtraction of one-digit and two-digit numbers, using mental calculations, where renaming does not occur.

*Solve word problems involving addition and subtraction within 100 (no renaming).

*Review addition of one-digit number to a two-digit number where renaming does occur, using mental calculations.

*Review subtraction of a one-digit number to a two-digit number, where renaming does occur, using mental calculations.

 

Chapter 2-Addition Without Renaming:

*Add a two-digit number to a two-digit number or three-digit number, without renaming, using the standard algorithm.

*Add within 1,000 without renaming using the standard algorithm.

*Solve word problems involving addition within 1,000, without renaming.

 

Chapter 3-Subtraction Without Renaming:

*Subtract a two-digit number from a two-digit number or three-digit number, without renaming, using the standard algorithm.

*Subtract within 1,000, without renaming, using the standard algorithm.

*Solve word problems involving subtraction within 1,000. without renaming.

*Add and subtract within 1,000, without renaming, using the standard algorithm for addition.

*Solve word problems involving addition and subtraction within 1,000, without renaming.

 

Chapter 4-Addition With Renaming:

*Add ones or tens to a three-digit number mentally.

*Add within 1,000, where renaming occurs in the ones.

*Add within 1,000, where renaming occurs in the tens.

*Add within 1,000, where renaming occurs in both the ones and the tens.

*Add three numbers within 1,000.

*Practice adding within 1,000.

 

Chapter 5: Subtraction With Renaming:

*Subtract ones or tens from a three-digit number mentally.

*Subtract within 1,000 where renaming occurs in the tens.

*Subtract within 1,000 where renaming occurs in the tens and the hundreds.

*Subtract when a hundred must be renamed as 9 tens and 10 ones.

*Practice subtracting within 1,000.

*Practice adding and subtracting within 1,000.

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