Transcript Lesson 2 and 3 for 9-8

Welcome back
~Mrs. Sampson~
• Please return to your seats
from yesterday. You need
everything for periods 1-4,
INCLUDING YOUR LUNCH.
Please take out any forms and
review agenda on side board.
Today’s Agenda
Sept. 8, 14
ACTIVATOR:
1. Homework is out on the corner of your desk,
copy down tonight’s homework.
2. Binder people, please pass out binders.
3. Activator: Take out your math packet
and notebook. In your notebook put today’s
date in the corner, and Activator on the first line. Copy and Answer:
For every 3 girls, there are 4 boys. There are
21 children in the class. How many
boys are there?
September 8, 2014
[Day B]
•SWBAT: use tape
diagrams to solve
problems when the part-to
part ratio is given and the
value of one of quantities
is given.
September 8, 2014
[Day B]
• Read and study the description of the
data in the chart.
• Answer the exploratory challenge
problems
Are the ratios 2:5 and 5:2 the same? Why or why not?
September 8, 2014
[Day B]
Write a one-sentence story problem about a ratio.
Equivalent ratio
Ratios that
have the same
value
Ex. 4:7 is
equivalent to
12:21
September 8, 2014 [Day B]
Exercise 2 (15 min.):
Lets represent this ratio in a
table.
The length of Shanni’s
Ribbon
The length of Mel’s
Ribbon
(in inches)
(in inches)
7
14
21
3
6
9
We use a tape diagram to represent the
ratio of the lengths of ribbon. Let’s
create one. 
September 8, 2014
[Day B]
Tape Diagram (Bar Model)
September 8, 2014
[Day B]
September 8, 2014
[Day B]
Exercise 3:
(a) Mason and Laney ran laps to train for the
long-distance running team. The ratio of the
number of laps Mason ran to the number of
laps Laney ran was 2 to 3.
September 8, 2014
[Day B]
Exercise 3 :
(b) If Laney ran 930 meters, how far did
Mason run? Draw a tape diagram to
determine how you found the answer.
September 8, 2014
[Day B]
Exercise 3 :
(c) What ratios can we say are
equivalent
to 2:3?
4:6 and 620:930
September 8, 2014
[Day B]
Exercise 4 :
Josie took a long multiple-choice, end-of-year vocabulary test. The ratio of the
number of problems Josie got incorrect to the number of problems she got
correct is 2:9.
(a) If Josie missed 8 questions, how many did she get correct? Draw a
tape diagram to demonstrate how you found the answer.
September 8, 2014
[Day B]
Exercise 4 :
(b) If Josie missed 20 questions, how many did she get correct? Draw
a tape diagram to demonstrate how you found the answer.
(c) How did you find the numbers?
Multiplied 5 ×2 and 5 ×9
September 8, 2014
EXIT TICKET:
[Day B]
write the Answers in your TTG page
Pam and her brother both open savings account. Each
began with $0. For every $2 that Pam saves in her
account, her brother saves $5 in his account.
If Pam has $40 in her account, how much money does her
brother have in his account? Use a tape diagram to
support your answer.
HOMEWORK: Lesson 3: Ratios
Problem Set #1-4 (page S.11)
In your agenda please copy
tonight’s homework and leave out
for me to stamp
• Math:
– Million Words due 9/19
– Class expectations due 9/10 need notebook and binder
– Lesson 3: Ratios Problem Set #1-4 (page S.11)
• Science: What’s next worksheet
• Social Studies: None
• English: go to website and watch summarizing video