Round to the nearest ten or hundred
Let's make numbers simpler! 🎯 Rounding helps us estimate by finding the closest 'friendly' number (like a ten or a hundred). It's like finding the nearest landmark on a map! 🗺️
Do this: Read the concept below, then try the quiz or activity.
Concept
Rounding gives us a simpler number that is close to the original number. We often round to the nearest ten or hundred to make mental math and estimations easier.
The Rule of the Rollercoaster: Imagine a rollercoaster. The hills are the tens (10, 20, 30...) or hundreds (100, 200, 300...). * The numbers 1, 2, 3, and 4 make you go back to the lower number. * The numbers 5, 6, 7, 8, and 9 make you go up to the next higher number.
Rounding to the Nearest Ten (Example: 67) 1. Identify the tens: 67 is between 60 and 70. 2. Look at the ones digit: The ones digit is 7. 3. Apply the rule: Since 7 is 5 or more, we 'round up'. 4. So, 67 rounds up to 70.
Rounding to the Nearest Hundred (Example: 342) 1. Identify the hundreds: 342 is between 300 and 400. 2. Look at the tens digit: The tens digit is 4. 3. Apply the rule: Since 4 is less than 5, we 'round down'. 4. So, 342 rounds down to 300.
Key Idea: To round to a certain place value, look at the digit to its immediate right. That digit is the 'boss' that tells you whether to round up or down.
Try it
Practice: Round to the nearest ten or hundred.