# 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 2,821 HW RoundingDecimalNumbers Unit1   Homework 1,258 Notes 4 Rounding Decimals 1,850

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