Learning Target:Students will learn how to round decimals to a given place value.

Using a number line to round:

You round a decimal by deciding which number it is closer to.

The same idea applies to the rounding rules.

Rounding Rule:To round a decimal to a given

place value, look at the digit in the place to the right.

- If the digit is 4 or less, round down.

- If the digit is 5 or greater, round up.

Use a number line / rounding rule to round the decimal as specified.

1. 1.3 (nearest one)

2. 3.86 (nearest tenth)

Answers:

1. 1

2. 3.9

Use a number line / rounding rule to round the decimal as specified.

1. 7.096 (nearest hundredth)

2. 3.9876 (nearest thousandth)

Answers:

1. 7.10

2. 3.988

When rounding small numbers we round to the leading digit to make the decimal easier to understand.

(1st nonzero digit as you read left to right)

Round the decimal to the leading digit.

1. 0.058

2. 0.0091

Answers:

1. 0.06

2. 0.009

Round the decimal to the leading digit.

1. 0.0952

2. 0.006192

Answers:

1. 0.1 or 0.10

2. 0.006

Can you round decimals to a given place value?