Overview

Grade 3 Math

Number

2. Describe and apply mental mathematics strategies for subtracting two 2-digit numerals

2.4 Subtracting with Digits Up to 1000

Subtracting with Digits Up to 1000

Learn how to subtract three digit numbers up to 1000 using place value columns, with clear steps and worked examples to build confidence.

What You'll Learn

Line up numbers by place value before subtracting hundreds, tens, and ones columns.

Subtract each column from right to left, starting with the ones place.

Recognize when a column needs regrouping because the top digit is smaller than the bottom digit.

Check a subtraction answer by adding it back to the number being subtracted.

Apply estimation to judge whether an answer to a 3 digit subtraction problem is reasonable.

What You'll Practice

Subtracting three-digit numbers with and without regrouping

Subtracting multiples of 10 and 100 from larger numbers

Computing differences using vertical subtraction format

Why This Matters

Mastering subtraction with larger numbers builds your confidence with everyday math like calculating change, measuring distances, and comparing quantities. This skill is essential for success in multiplication, division, and all future math courses.

This Unit Includes

1 Video lesson

Practice exercises

Learning resources

Skills

Subtraction

Place Value

Regrouping

Mental Math

Three-Digit Numbers

NS Curriculum Aligned