Fluently Subtracting within 1000
Need extra help for EL students? Try the Sharing the Subtraction Process pre-lesson.
Students will be able to solve subtraction problems within 1,000.
- 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)
- Provide student-friendly definitions for "place value," "regroup," "subtract," "thousands," "hundreds," "tens," and "ones" in their home language (L1).
- Have students repeat the information about place value to a partner.
- Have students read aloud the number 14,262 (fourteen thousand two hundred and sixy-two) before discussing where each digit falls in the place value chart.