Overview

Grade 2 Math

B1. Number Sense

1. B1.1 Whole Numbers

1.5 Converting between place values up to 999

Converting Between Place Values Up to 999

Discover how to trade ones for tens and tens for hundreds (and back again) as you convert between place values up to 999.

What You'll Learn

Recognize that ten ones make one ten and ten tens make one hundred

Convert a number of ones or tens into a mix of hundreds, tens, and ones

Apply the trading rule \( 10 \times 1 = 10 \) to move value up one place

Reverse the process by breaking a hundred into 10 tens or a ten into 10 ones

Use a place value chart to organize hundreds, tens, and ones while converting

Check answers by adding the converted parts back together to match the original number

What You'll Practice

Converting hundreds to tens (e.g., 5 hundreds = 50 tens)

Converting tens to hundreds with whole number results

Working with numbers up to 999 in different place value forms

Why This Matters

Understanding place value conversions helps you work flexibly with numbers in everyday situations like counting money, measuring distances, or estimating quantities. This skill is essential for mental math, rounding, and building the foundation for working with larger numbers and decimals.

This Unit Includes

Practice exercises

Learning resources

Skills

Place Value

Number Sense

Conversions

Hundreds

Tens

Multiplication

Division

ON Curriculum Aligned