Adding and Subtracting by Splitting
Adding and Subtracting by Splitting
Objectives
In this unit, students will add and subtract three-digit numbers by splitting. Students will:
- split each addend into hundreds, tens, and ones. Then they will add the sums of the hundreds, tens, and ones to find the sum of the original two addends.
- split the minuend into hundreds, tens, and ones. Then they will take away the hundreds, tens, and ones in the subtrahend to find the difference.
Essential Questions
How are relationships represented mathematically?
How can mathematics support effective communication?
How is mathematics used to quantify, compare, represent, and model numbers?
What does it mean to estimate or analyze numerical quantities?
What makes a tool and/or strategy appropriate for a given task?
- How are relationships represented mathematically?
- What makes a tool and/or strategy appropriate for a given task?
Vocabulary
- Expanded Form: A way to write numbers that shows the value of each digit (e.g., 4,372 = 4,000 + 300 + 70 + 2).
Duration
45–60 minutes
Prerequisite Skills
Prerequisite Skills haven't been entered into the lesson plan.
Materials
- whiteboard for each student
- whiteboard marker for each student
- whiteboard eraser for each student
- Adding and Subtracting by Splitting Worksheet (M-2-2-2_Adding and Subtracting by Splitting Worksheet and KEY.docx)
- Top-It directions (M-2-2-1_Top-It Directions.docx)
- Beat the Calculator directions (M-2-2-1_Beat the Calculator Directions.docx)
- number cards
- calculators
- paper
- pencils
Related Unit and Lesson Plans
Related Materials & Resources
The possible inclusion of commercial websites below is not an implied endorsement of their products, which are not free, and are not required for this lesson plan.
- http://www.math-play.com/soccer-math-subtracting-two-digit-numbers/subtracting-two-digit-numbers.html
- http://www.sheppardsoftware.com/mathgames/fruitshoot/fruitshoot_subtraction.htm
- http://www.sheppardsoftware.com/mathgames/fruitshoot/fruitshoot_addition.htm
- http://www.coolmath-games.com/1-number-games-addition-subtraction.html
- http://www.free-training-tutorial.com/subtraction-games.html
- http://fun4thebrain.com/subtraction.html
Formative Assessment
Suggested Instructional Supports
Instructional Procedures
Related Instructional Videos
Note: Video playback may not work on all devices.
Instructional videos haven't been assigned to the lesson plan.
Final 3/14/14