➕➖ Add and Subtract Decimals

📖 What the Section Is About

In this lesson, students practice both adding and subtracting decimals. They learn to line up decimal points carefully, then add or subtract digit by digit. This helps them solve problems with money, measurements, and real-life comparisons.

🎯 Learning Objectives

✅ Line up decimal points when adding or subtracting decimals
✅ Add decimals with tenths and hundredths
✅ Subtract decimals with tenths and hundredths
✅ Apply decimal operations in money and measurement problems
✅ Check answers for accuracy and reasonableness

🧪 Examples

  • 4.5 + 3.2 = 7.7

  • 2.75 + 1.40 = 4.15

  • 8.6 – 2.3 = 6.3

  • 7.25 – 4.05 = 3.20

📘 Key Vocabulary and Definitions

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

  • Decimal Point: The dot that separates whole numbers from fractional parts

  • Add: To combine numbers together

  • Subtract: To find the difference by taking away

  • Regroup: Borrowing or carrying when solving addition or subtraction problems

🎲 Fun Practice Activities

  1. Activity Worksheet: Mixed problems with money and measurements using decimals

  2. Test Yourself: 5.40 + 2.35 and 9.00 – 4.75

🏡 Offline Homework Idea

Go shopping with an adult. Add the prices of two items and subtract the total from the amount of money you have.