Lesson: Round Decimal Numbers

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Lesson Objective

SWBAT round decimal numbers to any given place

Lesson Plan

 

Standard

6NSO.N7 – Round whole numbers and decimals to any given place

Aim/Objective:

Key Points

SWBAT round decimal numbers to any given place

·          To round a number means to determine which benchmark it is the closest to

·         Rounded numbers end in zeros, however we don’t always have to write the zeros with decimals

Assessment:

Exit Ticket

1.       Round to the underlined digit:  438.845

2.       Round the following number to the nearest hundredth:  589.289

3.       Round the following number to the nearest dollar:  $58.76

4.       Round to the nearest whole number:  384,494.57

5.       Round to the nearest hundred:  743,982.491

 

Lesson

Do Now:

Review Rounding Practice from previous day:

-          Round 489,548 to nearest tenth

-          Round 5,389,438 to nearest thousand

-          Round 63,289,491 to nearest ten million

Materials:

 

Opening:

Reveal the decimal side of the place value chart and review place value names with quick questioning game (cold call): 

·         Which digit is in the_____ place?

·         What place is the ___ in?

·         What is the value of the _____?

·         Clarify the place value names – no “oneths” place

Intro/Direct Instruction:

·         Review aim with students – our goal by the end of class is to be able to round any number to any place asked

·         Yesterday, we had a chant and a demonstration to help us remember the rule for rounding

·         Remember that when we are rounding a number we are saying which benchmark is this number closer to – so if we are rounding to the nearest tenth, we are thinking which tenth is this number closest to

·         One way to think of this is to think of a number line – on number lines it can sometimes be easier to see which benchmark a number is closest to

·         During model of rounding numbers – show a number line to show visual how to determine which number it is closest to – continue to use the same way of showing the work during the model:  underline digit in the place you are rounding to, circle the digit to the right – if the digit in the circle is 0 – 4, keep the underlined digit the same; if the digit in the circle is 5-9, add one to the underlined digit.

o    Example 1:  Regular rounding with decimals

o    Example 2:  Round over a 9

o    Example 3:  Round to the nearest “dollar”

o    Example 4:  Round to the nearest “whole number”

·         Within examples, highlight that 58.8 and 58.80 have the same value and that either is an acceptable answer when rounding

Guided Practice

·         S will complete sample problems rounding decimal numbers 

o    Example 1:  Regular rounding with decimals

o    Example 2:  Round over a 9

o    Example 3:  Round to the nearest “dollar”

o    Example 4:  Round to the nearest “whole number”

Independent Practice

·         S will complete worksheet on rounding decimal numbers

·         Teacher and S will review answers after independent practice

·         S will complete exit ticket

Closing

·         Review key points with students 

·         If you are asked to round to the nearest dollar which place value are you rounding to?

·         True or false: 569.543 rounded to the nearest tenth is 569.5

·         Is there another way to write the answer for that question?

Accommodations

Fewer problems, place value chart provided for students

Skills Time

1.        Pre-test Computation Skills/Facts Practice

Lesson Resources

CW RoundingDecimalsNumbers Unit1   Classwork
1,997
HW RoundingDecimalNumbers Unit1   Homework
953
Notes 4 Rounding Decimals  
1,326

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