he goal of the Montgomery County Public Schools pre-K-12 mathematics program is for all students to achieve mathematical proficiency through mastery of mathematical skills, concepts, and processes.  The end result is the ability to think and reason mathematically and use mathematics to solve problems in authentic contexts. 

The mathematics curriculum at each grade level is organized into units of instruction.  The following statements provide an overview of what students should know and be able to do by the end of each unit in Grade 3.  Throughout all units, students will apply concepts and skills to solve problems, communicate and reason mathematically, and make mathematical connections.

Unit 1

• Represent three- and four-digit numbers in a variety of ways.
• Subtract two- and three-digit numbers with regrouping.
• Estimate sums and differences of numbers less than 1,000.
• Gather, organize, and display data using appropriate scales.
• Interpret, compare, and make predictions based on data from tables, pictographs*, and bar graphs.
• Solve problems by identifying and analyzing a variety of numeric patterns.
• Identify and describe a trend.

Unit 1 Math Websites

Unit 1 Study Guide

Rounding Review

Unit 2

• Estimate and / or measure length to solve problems.
• Estimate and count to find the area and perimeter of figures.
• Solve problems involving the area and perimeter of figures.

Unit 2 Expectations and Lessons for Review in Student Book

Unit 2 Web Resources

Quiz 1 Review

Unit 3

• Demonstrate mastery of multiplication and division facts for 0,1, 2, 5, and 10.
• Solve multiplication and division problems using a variety of strategies.
• Solve problems using estimation techniques and number properties.

Unit 3 Math Websites

Break Apart Strategy

Week 1 Review

Week 2 Review

Unit 3 Assessment Review

Unit 4

• Identify, describe, and classify two- and three-dimensional shapes.
• Identify angles and describe how they compare with right angles.
• Draw geometric figures using tools.
• Recognize three-dimensional objects from different perspectives.
• Identify and describe symmetry and congruence of geometric figures.
• Describe and represent slides, flips, and turns using pictures and objects.

Week One

Week Two

Week Three

Week Four

Unit 4 Resources

Unit 5

• Multiply and divide multi-digit numbers by one-digit numbers.
• Locate whole numbers and fractions with denominators of 2, 3 and 4 on a number line.
• Solve problems involving money through $100.00.
• List possible outcomes for an event and describe the likelihood of an event.
• Solve problems involving numeric equations or inequalities.

Unit 5 Overview

Unit 5 Math Resources

Unit 6

• Estimate and determine elapsed time using clocks and calendars.
• Choose appropriate measurement units and tools.
• Solve problems involving volume, weight, capacity, temperature, or time.

Review Resources

* A pictograph is a graph that uses pictures or symbols to show data.

Below are links to unit newsletters.  These provide information about the concepts taught during each unit, and how you can help.