Rounding Numbers to 10s and 100s

Grade 2 Mathematics Learning to Round Numbers

What is Rounding?

Rounding makes numbers easier to work with We change a number to the nearest 10 or 100 It's like finding the closest 'friendly' number

Place Value Review

Numbers have different places Ones place: 1, 2, 3, 4, 5, 6, 7, 8, 9 Tens place: 10, 20, 30, 40, 50, 60, 70, 80, 90 Hundreds place: 100, 200, 300, 400, 500

Rounding to the Nearest 10

Practice Rounding to 10s

Round these numbers to the nearest 10: 34 → ? 67 → ? 85 → ? Think: What's in the ones place?

Rounding to the Nearest 100

Rounding Rules Summary

{"left":"Rounding to 10s:\n• Look at the ones place\n• 0-4: Round DOWN\n• 5-9: Round UP","right":"Rounding to 100s:\n• Look at the tens place\n• 0-4: Round DOWN\n• 5-9: Round UP"}

Mixed Practice

Round to the nearest 10: 43 → ? Round to the nearest 100: 167 → ? Round to the nearest 10: 89 → ?

Think About It

Why do we round numbers? When might rounding be helpful? Can you think of a time when you've used rounding?

Great Job Learning to Round!

Today we learned: • How to round to the nearest 10 • How to round to the nearest 100 • When to round up or down • Why rounding is useful