OBJECTIVES;

Chapter 1: Find the Missing Number:

*Find the missing part in an addition or subtraction equation.

*Find the missing whole in a subtraction equation.

*Add numbers mentally to make 100.

*Subtract numbers mentally from 100.

Chapter 2: Methods for Mental Addition:

*Add ones or tens to a 2-digit number.

*Count on mentally.

*Add ones, tens, or hundreds to a 3-digit number.

*Add two 2-digit numbers.

*Add 99 or 98.

Chapter 3: Methods for Mental Subtraction:

*Subtract ones or tens from a 2-digit number.

*Subtract ones, tens or hundreds from a 3-digit number.

*Count back mentally.

*Subtract two 2-digit numbers.

*Subtract 99 or 98.