FRAME NUMBER 4

LEVEL A

1

A ratio of

(1:4) is verbally expressed an one to four.

4

4

Then a ratio of (4:1) is verbally expressed as

1

FRAME NUMBER 17

LEVEL B

If the ratio of two numbers equals the ratio of two other numbers, the four numbers form a

proportion. Example: 2 = 4

1=2

3

6

2

4

What number should represent the letter (X) to form a proportion of the following equation? Refer to

FRAME NUMBER if you have trouble.

a. 3

=X

b. 4

=8

c. 6

=X

5

10

5

X

9

3

FRAME NUMBER 30

LEVEL C

Type 2. The scale of a map is 1:35,000. What is the ground distance if the distance on the map

is 1.8 inches? Express in feet. We say, 1 is to 35,000 as map distance (1.8 inches) is to ground distance

(unknown). We write

1

=

1.8 .

35,000

X

Complete the solution: 35,000 x 1.8

=

12

9

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