# Rounding To Nearest 10 Or 100 Math Games

In this series of games, your students will learn to use place value understanding to round whole numbers to the nearest 10 or 100. The Rounding To Nearest 10 Or 100 learning objective — based on CCSS and state standards — delivers improved student engagement and academic performance in your classroom, as demonstrated by research. This learning objective directly references 3.NBT.A.1 as written in the common core national math standards.

Scroll down for a preview of this learning objective’s games and the concepts.

**Concepts Covered**

Place value in base ten groups numbers in bundles of 10’s with each place value being 10 of the prior unit. While moving to the right across the places in a number the digits represent smaller units. Rounding to the nearest 10 or 100 requires an approximation of the nearest number with no ones or no tens and no ones. Use of a number line to model the closest 10 or 100.

The rule for rounding the nearest 10 is to determine if the one’s unit has a digit that is 4 or below. If so, the one’s digit is rounded to 0 and the tens digit remains the same. If the one’s digit is a 5 or higher then the one’s digit is rounded to a 0 and the tens digit moves up one consecutive number. If rounding a 100’s number to the nearest 10 the hundreds digit remains the same unless the tens digit is a 9 and the one’s digit is 5 or greater. In that scenario, the hundreds digit increases by one consecutive number, and the tens and ones are both rounded to 0.

The rule for rounding to the nearest 100 is to determine if the tens unit has a digit that is 4 or below. If so, the ones and tens are rounded to 0 and the hundreds digit remains the same. If the one’s digit is a 5 or higher then the one’s digit is rounded to a 0 and the hundreds digit moves up one consecutive number. Rounding to the nearest 10 can produce a hundred if the tens place is a 9 and the one’s digit is 5 or

greater.

A preview of each game in the learning objective is found below.

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