Lesson: Rounding to the Nearest Hundred Mathematics • 3rd Grade

In this lesson, we will learn how to round whole numbers within 1000 to the nearest hundred by identifying the hundreds numbers it is between on a number line.

Lesson Plan

Students will be able to

say which two multiples of one hundred a given three-digit number lies between,
round a three-digit number to the nearest hundred using a number line,
round a three-digit number to the nearest hundred by considering the value of the tens digit,
say which numbers would round to a given value.

Lesson Video

Lesson Worksheet

Q1:

Which of the following number lines represent 647 to the nearest hundred?

Q2:

When we round to the nearest hundred, we underline the hundreds digit and then we check the tens digit. The tens digit tells us whether to round up or down.

Now, we want to round the number 763. Which digit do we underline?

Which digit do we check?

What is the result of the rounding?

Q3:

James has 456 marbles. We want to round this number to the nearest hundred.

Complete: The number 456 is between and .

How many marbles does James have, to the nearest hundred?