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Grade 3
Number
1. Describe and apply mental mathematics strategies for adding two 2-digit numerals
1.1 Introduction to integer addition
Introduction to Integer Addition
Discover the rules for adding positive and negative integers, from same-sign addition to combining opposite signs on a number line.
What You'll Learn
Identify integers as positive and negative whole numbers plus zero on a number line.
Apply the same-sign rule by adding absolute values and keeping the common sign.
Apply the different-sign rule by subtracting absolute values and keeping the sign of the larger one.
Model integer addition visually by moving right for positive numbers and left for negative numbers.
Recognize that adding a negative number is the same as moving backward on the number line.
Solve basic integer addition problems as a foundation for subtracting integers later.
What You'll Practice
1
Writing addition statements from diagrams with red and blue circles
2
Pairing positive and negative circles to find sums visually
3
Solving word problems about spending, donating, studying, and temperature
4
Finding opposites of integers on number lines by counting distance from zero
Why This Matters
Integer addition is essential for understanding positive and negative numbers in real life, from tracking money spent and earned to measuring temperature changes. Mastering this skill prepares you for algebra, working with equations, and making sense of situations involving gains and losses.
Before You Start — Make Sure You Can:
This Unit Includes
12 Video lessons
Practice exercises
Learning resources
Skills
Integer Addition
Positive and Negative Numbers
Zero Pairs
Number Line
Opposites
Visual Models
Word Problems
NS Curriculum Aligned