Introduction

Rounding and estimation help us work with numbers more quickly and easily in everyday life. It’s like simplifying a number while keeping it close to the original. In this lesson, you’ll learn when and how to round numbers and why estimation is useful in real-world situations.

What is Rounding?

Rounding means making a number simpler, but keeping it close to what it was.
We usually round to the nearest 10, 100, or 1,000.

Example:
27 rounded to the nearest 10 = 30
63 rounded to the nearest 10 = 60

🔹 Rule:

• If the digit is 5 or more, round up
• If the digit is 4 or less, round down

What is Estimation?

Estimation is making a smart guess.
We use it to get a quick idea of an answer without needing the exact number.

Example:
98 + 103 → Estimate: 100 + 100 = 200

We use estimation in shopping, measuring, and budgeting!

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Summary

Rounding and estimation are simple tools that help us work with numbers faster and make good guesses when exact answers aren’t necessary.

✅ Rounding means adjusting a number to the nearest 10, 100, or 1,000:

• If the digit is 5 or more, round up
• If the digit is 4 or less, round down

✅ Estimation helps us:

• Quickly approximate answers in daily life (shopping, budgeting, measuring)
• Save time when exact values aren’t required

These skills are especially useful in:

• Mental math
• Making decisions
• Solving real-world problems