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Topic C P lace value and rounding decimal fractionsPowerPoint Presentation

Topic C P lace value and rounding decimal fractions

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Module 1 Lesson 8

Objective:

Round a given decimal to any place using place value understanding and the vertical number line.

FOR THIS LESSON

Student

Personal White Boards

Student Pages

Problem Set

Exit Ticket

Homework

Teacher

Teacher Pages

Fluency Practice(12 minutes)

37 hundredths = _________

137 hundredths = _________

537 hundredths = _________

296 hundredths = _________

0.548 = _________ thousandths

1.548 = _________ thousandths

2.548 = _________ thousandths

7.352 = _________ thousandths

Round to Different Place Values

9

6 minutes

5.NBT.4

9

8.735

8.735

8.5

round to the ones

8.8

8.74

8

8.75

8.74

8.735

8.735

round to the tenths

round to the hundredths

8.7

8.735

8.7

8.73

8

7.5

round to the ones

7

7.5

7.458

7.46

7.458

7.5

7

7.46

7.458

7.45

round to the tenths

7.455

round to the hundredths

7.4

7.45

(6 minutes)

Organic, whole-wheat flour sells in bags weighing 2.915 kilograms? How much flour is this rounded to the nearest tenth? How much flour is this rounded to the nearest one? What is the difference of the two answers? Use a place value chart and number line to explain your thinking.

Concept Development (32 minutes)

9.949 round to the nearest tenth and hundreth

9.949

10

decomposition tenths

9.95

9.95

9.9

decomposition hundredths

9.955

9.94

28

Determine the maximum and minimum possible values

_______ 27

27.5

maximum

27

27

26.5

minimum

26

Student Debrief (10 minutes)

Compare how we rounded in lesson 7 to lesson 8. How are they alike? How are they different?

Once a number rounds up at one place value, does it follow then that every place value will round up? Why or Why not?

How does the place value chart help organize your thinking when rounding

EXIT TICKET (3 minutes)

Complete the exit ticket and turn in...

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