1. Warm Up
Problem of the Day
Lesson Presentation
Lesson Quizzes

2. Warm Up
Divide.
÷ 3
÷ 3
÷ 7.6
÷ 4.8
5.088
1.26 45
5.9

3. Divide your age in months by 12. What does the quotient tell you?
Problem of the Day
Divide your age in months by 12. What does the quotient tell you?
my age in years

4. Learn to solve problems by interpreting the quotient.

5. To divide decimals, first write the divisor as a whole number
To divide decimals, first write the divisor as a whole number. Multiply the divisor and dividend by the same power of ten.
Remember!

6. Additional Example 1: Measurement Application Suppose Mark wants to make bags of slime. If each bag of slime requires 0.15 kg of corn starch and he has 1.23 kg, how many bags of slime can he make?
The question asks how many whole bags of slime can be made when the corn starch is divided into groups of 0.15 kg.
1.23 ÷ 0.15 = ?
1.23 ÷ 0.15 = 8.2
Think: The quotient shows that there is not enough to make 9 bags of slime that are 0.15 kg each. There is only enough for 8 bags. The decimal part of the quotient will not be used in the answer.
Mark can make 8 bags of slime.

7. Check It Out: Example 1
Suppose Antonio wants to make bags of slime. If each bag of slime requires 0.15 kg of corn starch and he has 1.44 kg, how many bags of slime can he make?
The question asks how many whole bags of slime can be made when the corn starch is divided into groups of 0.15 kg.
1.44 ÷ 0.15 = ?
1.44 ÷ 0.15 = 9.6
Think: The quotient shows that there is not enough to make 10 bags of slime that are 0.15 kg each. There is only enough for 9 bags. The decimal part of the quotient will not be used in the answer.
Antonio can make 9 bags of slime.

8. Additional Example 2: Photography Application
There are 237 students in the seventh grade. If Mr. Jones buys rolls of film with 36 exposures each, how many rolls will he need to take every student’s picture?
The question asks how many rolls are needed to take a picture of every one of the students.
237 ÷ 36 = 6.583 __
Think: 6 rolls of film will not be enough to take every student’s picture. Mr. Jones will need to buy another roll of film The quotient must be rounded up to the next highest whole number.
Mr. Jones will need 7 rolls of film.

9. Check It Out: Example 2
There are 342 students in the seventh grade. If Ms. Tia buys rolls of film with 24 exposures each, how many rolls will she need to take every student’s picture?
The question asks how many rolls are needed to take a picture of every one of the students.
342 ÷ 24 = 14.25
Think: 14 rolls of film will not be enough to take every student’s picture. Ms. Tia will need to buy another roll of film. The quotient must be rounded up to the next highest whole number.
Ms. Tia will need 15 rolls of film.

10. Additional Example 3: Social Studies Application
Gary has meters of rope. If he cuts it into 13 equal pieces, how long is each piece?
The question asks how long each piece will be when the rope is cut into 13 pieces.
Think: The question asks for an exact answer, so do not estimate. Use the entire quotient.
42.25 ÷ 13 = 3.25
Each piece will be 3.25 meters long.

11. Check It Out: Example 3
Ethan has meters of rope. If he cuts it into 15 equal pieces, how long is each piece?
The question asks how long each piece will be when the rope is cut into 15 pieces.
Think: The question asks for an exact answer, so do not estimate. Use the entire quotient.
64.20 ÷ 15 = 4.28
Each piece will be 4.28 meters long.

12. When the question asks
You should
How many whole groups can be made when you divide?
Drop the decimal part of the quotient.
How many whole groups are needed to put all items from the dividend into a group?
Round the quotient up to the next highest whole number.
What is the exact number when you divide?
Use the entire quotient as the answer.

13. Lesson Quizzes
Standard Lesson Quiz
Lesson Quiz for Student Response Systems

14. Lesson Quiz
Solve.
1. The cross-country team’s goal is to run mi next week. If they run only 5 days next week, how many miles would they have to run each day?
2. Shannon is having a surprise party for her parents. She wants to invite 22 friends. Invitations come in packages of 8. How many packages does Shannon need to buy?
5.25 mi 3

15. Lesson Quiz for Student Response Systems
1. A packet of 12 tennis balls weighs ounces. What is the average weight of one ball?
A ounces
B ounces
C ounces
D ounces

16. Lesson Quiz for Student Response Systems
2. Smith buys 53 apples at the grocery store. The shopkeeper packs these apples in boxes. If each box can contain 9 apples, how many boxes does the shopkeeper need?
A. 6 boxes
B. 7 boxes
C. 8 boxes
D. 9 boxes