Page 224 - NUMINO TG_6A

14100% Unit

3 . Find the value of c using a proportion. 3. Have students use proportions to solve
these problems. Again, they are just solving
a. c% of 50 is 15. b. c% of 36 is 27. for the variable in a different position in the
same proportion equation.
c = 15 15 c = 27 100
100 50 100 36
c 50 = 100 c 36 = 27

50 c = 30 100 25 c = 750 20

4. Have students solve the word problems

c. c% of 50 is 35. d. c% of 25 is 15. using proportions. Remind students to assign

c = 35 c = 15 a variable to the number they are solving for.
100 50 100 25
c 50 = 100 35 c 25 = 100 15 What percent of his money does Ryan has
20 20
25 c = 700 25 c = 600 left? Express this in percentage form, ratio

form, and decimal form. Ryan has $60 left

which is 75%, or 3 , or 0.75 of his allowance
4

4 . Solve the word problems. left.

a. Ryan receives $80 for this month’s allowance from his parents. He spent $20

to buy books. What percent of his allowance did he spend to buy books?

percent = c, c = 20 25%
100 80

c 80 = 100 20

c = 25

b. Ann and Jessica have $90 to spend. They spent $54 to buy toys. What
percent of $90 did they spend to buy toys?

percent = c, c = 54 60%
100 90

c 90 = 100 54

c = 60

14. 100% 127

Reexamine with your class how to do this problem step by step.
Example: c% of 100 is 50.

c 50
100 100

c ( 50 ) 100
100

c 50

6A Unit 14 207