Do NowEstimate each quotient.1.) 53.4 ÷ 6.15 2.) 312.4 ÷ 2.88

Solve.3.) 2.4 × 5.7

9 100

13.68

1-2 C Continued…

Example 2Find 8.69 22

Place the decimal point.0.

– 6 62 0 9

3

– 1 9811 0 Annex a zero and continue dividing.

– 1100

950

Estimate

8.69 ÷ 22 = 0.395; Compared to the estimate, the quotient is reasonable.

Example 3Emma is purchasing lumber to build a porch. The table shows the cost of the boards. If Emma buys a 12-foot board, how much does it cost per foot?

Example 3To find the cost per foot, divide $6.48 by 12.

Place the decimal point.0.

– 6 04 8

5

– 480

4

The cost of the board is $0.54 per foot.

Example 4Jack and his sister are sharing the cost of a digital camera. The camera costs $88.50. If Jack saved $50 to buy the camera, how much does his sister have left after paying her share of the camera?

Estimate $90 ÷ 2 = 45; $50 – $45 = 5 Step 1 Determine how much Elena will pay for the

camera.

Example 4

Place the decimal point..

– 80 8

4

– 80 5

– 4

4 2

10– 10

0

5

Example 4

$50.00– $44.25

$5.75

$50.00 – $44.25 = $5.75

Elena has $5.75 left.

Exit Ticket

1) Five dozen eggs cost $10.50. Find the cost of one dozen. How much change will you receive if you pay for one dozen eggs with a five dollar bill?

2) Meg is purchasing lumber to build a porch. The table shows the cost of the boards. If Meg buys a 10-foot board, how much does it cost per foot?

3) 1.25 ÷ 5

$3.90

$0.58

0.25

9/19/2014 1-2 E Divide Decimals by Decimals

• To divide a decimal by a decimal, make the divisor a whole number. – The amount of places you move the decimal in the

divisor move the SAME AMOUNT of places in the dividend

Example 1Find 5.94 0.2.

Move the decimal point so that the divisor is a whole number.

Move the same amount of decimal spots in the dividend.

2 Place the decimal point..

– 41 9

9

– 1 81 4

– 140

7

Divide as with whole numbers.

Check by multiplying the quotient and divisor. If correct product will match dividend.

1 50

Example 2Find 8.1 ÷ 0.054.

– 54270

– 2700 0

Write a zero in the ones place of the quotient because 0 ÷ 54 = 0.

Answer: So, 8.1 ÷ 0.054 = 150.

Example 3Find 0.052 1.3.

Move the decimal place to make the divisor a

whole number.

– 00 5

– 0 05 2

– 520

Answer: So, 0.052 ÷ 1.3 is 0.04.

0 40. Place the decimal point.

Example 4Francisco made $357.25 last week. Erin made $185.30. How many times as much money did Francisco make as Erin? Round to the nearest tenth.

Find 357.25 ÷ 185.3.291.

– 18531719 5

– 16677518 0

– 37061474

0

To the nearest tenth, 357.25 ÷ 185.30 = 1.9. So Francisco made about 1.9 times as much as Erin.

Exit Ticket

1.) 3.8 ÷ 0.2

2.) 9.3 ÷ 0.6

3.) A truck traveled 93.66 miles on 4.2 gallons of gas. How many miles did the truck travel per gallon of gas?

19

15.5

22.3 mpg

Homework

• Pg. 58 #1-32 Evens• QUIZ CORRECTIONS ARE DUE ON WEDNESDAY

9/24!!!!• Ch.1 Quiz on Tuesday 9/23! (Start Studying!)