Round, Add, and Subtract Two- and Three-Digit Numbers
Round, Add, and Subtract Two- and Three-Digit Numbers
Objectives
In this unit, students will round, add, and subtract two- and three-digit numbers. More specifically, they will:
- round two-digit and three-digit numbers to the nearest ten.
- round three-digit numbers to the nearest hundred.
- add two-digit and three-digit numbers using the standard algorithm.
- subtract two-digit and three-digit numbers using the standard algorithm.
Essential Questions
- How is mathematics used to quantify, compare, represent, and model numbers?
- How are relationships represented mathematically?
- What does it mean to estimate or analyze numerical quantities?
- What makes a tool and/or strategy appropriate for a given task?
- When is it appropriate to estimate versus calculate?
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.
Rounding
- http://www.free-training-tutorial.com/rounding/rounding-spaceships.html
- http://www.free-training-tutorial.com/rounding/sharks.html
Addition and Subtraction
Formative Assessment
Final 04/12/13