Materials
Reminders
Get out your agenda if you see
your name below. I would like
to have you in my FLEX
tomorrow.
Period 2
Period 7
Which of the following is the
best value?
A dozen donuts for $3.76
Or
A 20-pack of donuts for $6
4-2 Proportional and
Nonproportional
Relationships
How do I identify proportional and
nonproportional relationships?
Important
Vocabulary
Proportional – two quantities with a constant ratio
Example:
6
12
𝑎𝑛𝑑
10
20
Nonproportional – two quantities that do not have a constant ratio
Example:
1
2
𝑎𝑛𝑑
5
6
Questions:
How do I
identify
proportional
relationships?
Notes:
Determine whether the ratio between the two quantities remains
the same
Example:
1 shrimp costs $0.50
2 shrimp cost $1.00
3 shrimp cost $1.50
Note that the unit cost of one shrimp remains the same
How do I
identify
nonproportional
relationships?
Determine whether the ratio between the two quantities does
not remain the same
Example:
1 shrimp costs $0.50
2 shrimp cost $0.75
3 shrimp cost $1.00
Quick Write
Bubba eats 200 shrimp every day. Bubba keeps track of the total number of
shrimp he has eaten each week in the following table.
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
200
400
600
800
1000
1200
1400
On the blank side of your Cornell Notes, write in
complete sentences whether or not the table
above shows a proportional or nonproportional
relationship. Explain in great detail your
reasoning.
Quick Write
Forrest tries to keep up with Bubba’s shrimp eating. Forrest keeps track of
the total number of shrimp he has eaten each week in the following table.
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
50
100
125
200
275
300
325
On the blank side of your Cornell Notes, write in
complete sentences whether or not the table
above shows a proportional or nonproportional
relationship. Explain in great detail your
reasoning.
Homework
Page 196-197; 6-8, 13-16
and 20
AND Cornell Notes
Summary