Download - 01/05/10 Divide Decimals#5

01/05/10 Divide Decimals #5

Today’s Plan:-Multiplication Practice-Correct Homework-Divide Decimals

Learning Target: -I will divide decimals.

Warm Up:

1) 5×6

2) 1×6

3) 4×6

4) 9×6

5) 6×10

6) 6×8

7) 6×2

8) 6×3

9) 7×6

10) 6×6

11) 6×100

12) 6×11

LT: I will divide decimals.


Timed Test 1-5





Correct Homework




Divide. Estimate to check whether the answer is reasonable.

Additional Example 1A: Dividing Decimals by Integers

A. 36.75 ÷ 7

)5

–351

–143

–3 50

Place the decimal point for the answerdirectly above the decimal under the division symbol.

Divide as with whole numbers.

Estimate35 ÷ 7 = 5 5.25 is a reasonable answer.

36.757.

7

2

5

5

Course 2

4-4 Dividing Decimals by Integers


Additional Example 1B: Dividing Decimals by Integers

B. 0.87 ÷ 3

)0

–627

–270



Estimate0.9 ÷ 3 = 0.3 0.29 is a reasonable answer.

0.873 .29

Course 2


Course 2


When you divide two numbers with different signs, the answer is negative.

Remember!


Additional Example 1C: Dividing Decimals by Integers

C. 82.08 ÷ (–27)

)3

–811–01

–1080


Estimate90 ÷ –30 = –3 The answer is reasonable.

.

0

08

Course 2


82.08 ÷ (–27) = –3.04

The signs are different.

Think: 82.08 ÷ 27. 27 82.08

04

Try This: Example 1A

Insert Lesson Title Here

Course 2



A. 39.16 ÷ 4

)9

–363

–283

–3 60



Estimate9.79 is a reasonable answer.

39.164.

1

7

6

9

40 ÷ 4 = 10

Try This: Example 1B


Course 2



B. 0.56 ÷ 4

)0

–416

–160



Estimate0.6 ÷ 4 = 0.15 0.14 is a reasonable answer.

0.564 .14

Try This: Example 1C


Course 2



C. 65.16 ÷ (–12)

)5

–605

–4 8

–360


Estimate

The answer is reasonable.

.

1

36

65.16 ÷ (–12) = –5.43

The signs are different.

Think: 65.16 ÷ 12 12 65.16

43

60 ÷ –12 = –5

•Assignment•Page 208 #8-14




Division Vocabulary

• The dividend is the number that is being divided. • The divisor is the number that the dividend will be divided by. • The quotient is the number of times the divisor will go into the

dividend. (The answer to the division problem.) dividend ÷ divisor = quotient or quotient

divisor )dividend

• In this example 5 is the divisor, 36 is the dividend, 7.2 is the quotient.

– 35)5 36.0

7.2

10 – 10

0

36 ÷ 5 = 7.2