How do you round 5.1 to the nearest whole number?

In this lesson you will learn to round decimals to the nearest

whole number by using a number line.

Let’s ReviewLet’s Review

0 1 2 3 4 5 6 7 8 9

Number Line

Let’s ReviewLet’s Review

15 = 15.0

365 = 365.0

674 = 674.0

Let’s ReviewCore Lesson

How do you round 7.7 to the nearest whole number using a number line?

7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8

= Numbers closer to 7= Numbers closer to 8

Let’s ReviewCore Lesson

How do you round 5.1 to the nearest whole number?

5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6

= Numbers closest to 5= Numbers closest to 6

In this lesson you have learned to round decimals to the

nearest whole number by using a number line.

Let’s ReviewGuided Practice

How do you round 8.5 to the nearest whole number?

8 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 9

= Numbers closest to 8= Numbers closest to 9

Let’s ReviewExtension Activities

The five top swimmers in an event had the following times:

Emily 64.5 secondsMolly 64.4 secondsMartha 63.9 secondsKathy 64.8 secondsRhonda 63.3 seconds

Using a number line illustrate how to round these numbers to the nearest whole number.

Let’s ReviewExtension Activities

Base Block Decimals

Get a partner and a set of base ten blocks.Rods = ones place, units =tenths place.1

2Create the following decimals using the base ten blocks:4.2 7.6 9.3 5.4

3.1 6.5 2.9 8.7

3 Round the decimals to the nearest whole number.

Let’s ReviewQuick Quiz

How do you round 4.6 to the nearest whole number using a number line?

How do you round 9.2 to the nearest whole number using a number line?