Adding and Subtracting Three-Digit Numbers Without Regrouping Using Base-Ten Blocks
Adding and Subtracting Three-Digit Numbers Without Regrouping Using Base-Ten Blocks
Objectives
In this unit, students will add and subtract three-digit numbers using base-ten blocks. Students will:
- use base-ten blocks to represent each addend in the equation and join the base-ten blocks to find the sum.
- use base-ten blocks to represent the minuend and take away the base-ten blocks that represent 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
- Digit: A symbol used to make a number. 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 are the ten digits we use to write numbers.
- Hundreds: The place third from the right in a number. In the number 2, 435 the digit 4 is in the hundreds place.
- Ones: The place first from the right in a number. In the number 2, 435 the digit 5 is in the ones place.
- Place Value: The value of the position of a digit in a number. In the number 7,863, the 8 is in the hundreds place and its value is 800.
- Tens: The place second from the right in a number. In the number 2, 435 the digit 3 is in the tens place.
Duration
45–60 minutes
Prerequisite Skills
Prerequisite Skills haven't been entered into the lesson plan.
Materials
- base-ten blocks
- mini-whiteboard for each student
- whiteboard marker for each student
- whiteboard eraser for each student
- Adding and Subtracting Using Base-Ten Blocks Worksheet (M-2-2-1_Adding and Subtracting Using Base-Ten Blocks 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