ROUNDING NUMBERS

Rounding means to adjust a number to make it easier to work with. Many times numbers are rounded to the nearest multiple of 10, 100, 1000, ...
Example: 11,355 rounded to the nearest thousand is 11,000.

Follow these steps to rounding and you can't go wrong:

Step 1: Find the digit in the place you are rounding to.
Step 2: Look at the digit to the right. If that number is a 4 or lower, then the digit in the place you're rounding to doesn't change and the numbers after become zeros. If that number is 5 or higher, then the digit in the place you are rounding goes up by 1.

Round 427 to the nearest 100.

427       (Find the digit in the place you are rounding to.)

427      (Look at the digit to the right. If that number is a 4 or lower, then the digit in the place you are rounding to doesn't change and the numbers after become zero. If that number is 5 or higher, then the digit in the place you are rounding goes up by 1.)

Because the 2 is 4 or lower, my answer is 400.
427 rounded to the nearest 100 is 400. 427 is closer to 400 than it is to 500.

COOL LINKS:

Basket Math - Test your rounding skills!

Funbrain - Place Value Puzzler

Quia - Rounding Decimals and Whole Numbers

Seashell Rounding - Online Activity

Jeopardy - Decimal and Whole Numbers

Rounding PowerPoint - Excellent presentation on rounding! Check it out!