📘 Choose Decimals with a Particular Sum or Difference

📖 What the Section Is About

In this section, students practice finding decimals that add up to or subtract to a given number. They explore different pairs of decimals that make the same result. This helps students build number sense and flexibility when working with decimals.

🎯 Learning Objectives

✅ Identify pairs of decimals with a given sum
✅ Identify pairs of decimals with a given difference
✅ Explore multiple ways to solve for missing decimals
✅ Strengthen understanding of place value in decimals
✅ Apply problem-solving strategies with decimals

🧪 Examples

  • 0.4 + 0.6 = 1.0

  • 1.2 − 0.5 = 0.7

  • 2.5 can be made by 1.0 + 1.5 or 0.8 + 1.7

  • To make a difference of 0.3: 1.5 − 1.2 or 2.0 − 1.7

📘 Key Vocabulary and Definitions

  • Sum: The answer to an addition problem

  • Difference: The answer to a subtraction problem

  • Decimal: A number that shows parts of a whole using place value (tenths, hundredths)

  • Equation: A math statement that shows two sides are equal

🎲 Fun Practice Activities

  1. Activity Worksheet: Fill in the missing decimal to make the sum or difference.

  2. Test Yourself: Interactive Practice Quiz.

🏡 Offline Homework Idea

Write down 5 different pairs of decimals that add up to 2.0.