➖ Subtract Decimal Numbers

📖 What the Section Is About

In this lesson, students learn how to subtract decimals by carefully lining up the decimal points. They practice subtracting tenths and hundredths to solve everyday problems. This skill is important for handling money, measurements, and comparing quantities.

🎯 Learning Objectives

✅ Line up decimal points before subtracting
✅ Subtract decimals with tenths and hundredths
✅ Regroup when subtracting across place values
✅ Apply subtraction of decimals to real-world problems
✅ Check answers for reasonableness

🧪 Examples

  • 5.4 – 2.1 = 3.3

  • 7.25 – 3.05 = 4.20

  • 6.8 – 2.35 = 4.45

  • 9.00 – 4.56 = 4.44

📘 Key Vocabulary and Definitions

  • Decimal: A number with a decimal point that shows parts of a whole

  • Decimal Point: The dot separating whole numbers from fractions of a whole

  • Subtract: To find the difference between numbers by taking away

  • Regroup: Borrowing from another place value when subtracting

🎲 Fun Practice Activities

  1. Activity Worksheet: Subtract decimals in money word problems

  2. Test Yourself: 8.75 – 2.50 and 6.40 – 3.85

🏡 Offline Homework Idea

Use a ruler to measure two objects in centimeters. Subtract the shorter length from the longer one to find the difference.