Topic E m ultiplying decimals

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Topic E m ultiplying decimals. STANDARD - 5.NBT.2, 5.NBT.3, 5.NBT.7. Grade 5 Module 1 Lesson 11. Objective:

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Presentation Transcript
Topic E

multiplying decimals

STANDARD - 5.NBT.2, 5.NBT.3, 5.NBT.7

Module 1 Lesson 11

Objective:

Multiply a decimal fraction by single-digit whole  numbers, relate to a written method through  application of the area and place value  understanding, and explain the reasoning used.

MATERIALS NEEDED

FOR THIS LESSON

Student

Student Pages

Problem Set

Exit Ticket

Homework

Place Value Chart

Personal White Boards

Teacher

Teacher Pages

Take Out the Unit

4 minutes

5.NBT.1

1.234 = _________ thousandths

Say the number: 65.247

76.358 = 7 tens _____ thousandths

76.358 = 736 tenths _________ thousandths

76.358 = _________ hundredths 8 thousandths

6 minutes

5.NBT.7

7258 thousandths + 1 thousandth =

7 ones 258 thousandths + 3 hundredths =

7258 thousandths + 1 thousandth =

7 ones 258 thousandths + 4 tenths =

6 ones 435 thousandths + 4 hundredth =

2 ones 37 thousandths + 5 tenths =

6 ones 35 hundredths + 7 thousandths =

4 ones 8 hundredths - 2 ones =

___ ones ___ hundredths

9 tenths - 7 thousandths - 4 thousandths =

4 ones 582 thousandths - 3 hundredths =

9 ones 708 thousandths - 4 tenths =

Application Problem (5 minutes)

After school, Marcus ran 3.2km and Cindy ran  1.95km. Who ran farther? How much farther?

Problem 1

Multiplying decimals

3 x 0.2

ones

tenths

Problem 2

Multiplying decimals

3 x 0.3

ones

tenths

Problem 3

Multiplying decimals

4 x 0.3

ones

tenths

Problem 4

Multiplying decimals

2 x 0.43

ones

tenths

hundredths

4 tenths + 3 hundredths

2

0.8 + 0.06 = 0.86

Problem 5

Multiplying decimals

ones

tenths

hundredths

thousandths

2 x 0.423

4 tenths + 2 hundredths + 3 thousandths

4 hundredths

2

8 tenths

6 thousandths

1.2 + 0.04 + 0.006 = 0.846

Problem 6

Multiplying decimals

ones

tenths

hundredths

thousandths

4 x 0.423

4 tenths + 2 hundredths + 3 thousandths

8 hundredths

4

16 tenths

12 thousandths

1.6 + 0.08 + 0.012 = 1.692

Problem 7

Multiplying decimals

6 x 1.21

1 one + 2 tenths + 1 hundredth

6

6 ones

6 hundredths

12 tenths

6 + 1.2 + 0.06 = 7.26

Problem 7

Multiplying decimals

7 x 2.41

2 one + 4 tenths + 1 hundredth

7

14 ones

7 hundredths

28 tenths

14 + 2.8 + 0.07 = 16.87

Problem 7

Multiplying decimals

8 x 2.34

2 one + 3 tenths + 4 hundredth

8

16 ones

32 hundredths

24 tenths

16 + 2.4 + 0.32 = 18.72

Problem Set (10 minutes)