1. Do Now
Estimate each quotient. 1.) 53.4 ÷ ) ÷ 2.88 Solve. 3.) 2.4 × 5.7 9
100
13.68

2. 1-2 C Continued…

3. Example 2 Find 8.69  22 Estimate 0. 3 9 5 Place the decimal point.
– 6 6
2 0 9
– 1 98 11
Annex a zero and continue dividing.
– 110
8.69 ÷ 22 = 0.395; Compared to the estimate, the quotient is reasonable.

4. Example 3
Emma 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?

5. Example 3 To find the cost per foot, divide $6.48 by 12. 0. 5 4
Place the decimal point.
– 6 0 4 8
– 48
The cost of the board is $0.54 per foot.

6. Example 4
Jack and his sister are sharing the cost of a digital camera. The camera costs $ 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.

7. Example 4 4 4 . 2 5
Place the decimal point.
– 8 8
– 8 5
– 4 1
– 10

8. Example 4
$50.00
– $44.25
$5.75
$50.00 – $44.25 = $5.75
Elena has $5.75 left.

9. Exit Ticket

10. Five dozen eggs cost $10. 50. Find the cost of one dozen
Five dozen eggs cost $ Find the cost of one dozen. How much change will you receive if you pay for one dozen eggs with a five dollar bill?
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

11. 9/19/2014 1-2 E Divide Decimals by Decimals

12. 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

13. Example 1
Find 5.94  0.2.
Move the decimal point so that the divisor is a whole number. 2 9 . 7
Place the decimal point.
– 4
Divide as with whole numbers.
Move the same amount of decimal spots in the dividend. 1 9
– 1 8 1 4
– 14

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

15. Example 2
Find 8.1 ÷ 1 5
– 54 27
Write a zero in the ones place of the quotient because 0 ÷ 54 = 0.
– 270
Answer: So, 8.1 ÷ = 150.

16. Move the decimal place to make the divisor a whole number.
Example 3
Find  1.3. . 4
Place the decimal point.
– 0
Move the decimal place to make the divisor a whole number. 5
– 0 0 5 2
– 52
Answer: So, ÷ 1.3 is 0.04.

17. Example 4
Francisco made $ last week. Erin made $ How many times as much money did Francisco make as Erin? Round to the nearest tenth.
Find ÷ 1 . 9 2
– 1853
1719 5
– 16677
518
– 3706
1474
To the nearest tenth, ÷ = 1.9. So Francisco made about 1.9 times as much as Erin.

18. Exit Ticket

19. 1.) 3.8 ÷ ) 9.3 ÷ ) A truck traveled miles on 4.2 gallons of gas. How many miles did the truck travel per gallon of gas? 19
15.5
22.3 mpg

20. Homework
Pg. 58 #1-32 Evens
QUIZ CORRECTIONS ARE DUE ON WEDNESDAY 9/24!!!!
Ch.1 Quiz on Tuesday 9/23! (Start Studying!)