Fluently Subtracting within 1000

Introduction

• Invite students to bring their math journals and a pencil to the class meeting area.
• Tell them to place their supplies on the floor next to them.
• Tell the students that today we're going to learn a strategy for solving subtraction problems within 1,000.
• Let the students know that to solve for these problems they must have a strong grasp of place value, which we will do a review of, before proceeding.
• Write “Place Value” on the board. Under this term, write the following:

Place: The position of a digit in a number.     
10,000s      1,000s      100s      10s      1s 
Value: The value of the digit in its place

• Ask students what the term place means in regards to a number. As the students share, place the correct definition next to the term.
• Ask the students to share what the term value means in regards to a number. As the students share, place the correct definition next to the term.
• Come up with a number, for example 14,262, to show the students how to correlate or determine the place and value of specific digits. Make a chart on the board showing these values. For example:

                   1             4           2          6        2 
Place:       10,000s       1,000s       100s       10s       1s           
Value:       10,000        4,000        200        60        2
                (10,000x1)    (1000x4)     (100x2)    (10x6)    (1x2)