Thursday, March 13

Lesson 3.3

Rounding Decimals

Rounding Decimals

Objective: To understand how to round decimals.

Rounding Decimals

Decimals can be rounded just as you round whole numbers.

Rounding Decimals

Round 123.1415 to the tenths place.

How to round a decimal.Step 1 – Underline which digit is to be rounded.

Rounding Decimals

Round 123.1415 to the tenths place.

How to round a decimal.Step 1 – Underline which digit is to be rounded.

Rounding Decimals

Round 123.1415 to the tenths place.

How to round a decimal.Step 2 – Determine which digit is to the right of the rounded digit.

Rounding Decimals

Round 123.1415 to the tenths place.

How to round a decimal.Step 2 – Determine which digit is to the right of the rounded digit.

Rounding Decimals

Round 123.1415 to the tenths place.

How to round a decimal.Step 3 – Apply the rounding rule.

If the digit is 4 or less, the underlined digit remains the same. If the digit is 5 or more, add 1 to the underlined digit.

Rounding Decimals

Round 123.1415 to the tenths place.

How to round a decimal.Step 3 – Apply the rounding rule.

Since the digit in the example is less than 4, the underlined digit does not change. The rounded number is 123.1

Rounding Decimals

Round 56.87 to the tenth place.

Do this on your own.

Rounding Decimals

Round 56.87 to the tenth place.

Since the digit to the right of the tenths place is 5 or greater , the rounded number is 56.9

Rounding Decimals

Round 1.325 to the ones place.

Do this on your own.

Rounding Decimals

Round 1.325 to the ones place.

Since the digit to the right of the ones place is less than 4, the rounded number is 1.

Rounding Decimals

Round 99.98 to the tenths place.

Do this on your own.

Rounding Decimals

Round 99.98 to the tenths place.

Since the digit to the right of the tenths place is 5 or greater , the rounded number is 100.

Rounding Decimals

Round 99.9815 to the hundredths place.

Do this on your own.

Rounding Decimals

Round 99.9815 to the hundredths place.

Since the digit to the right of the hundredths place is 4 or less , the rounded number is 99.98

Rounding Decimals

Round 134.7804 to the hundredths place.

Do this on your own.

Rounding Decimals

Round 134.7804 to the hundredths place.

Since the digit to the right of the hundredths place is 4 or less , the rounded number is 134.78

Rounding Decimals

Round 56.786453 to the hundredths place.

Do this on your own.

Rounding Decimals

Round 56.786453 to the hundredths place.

Since the digit to the right of the hundredths place is 5 or more , the rounded number is 56.79

Rounding Decimals

Agenda Notes –In class work –

Rounding Decimals ( white paper - front and back)

Homework – Practice Skills 3-3

Due Friday March 14