FRAME NUMBER 5

LEVEL A

The grouping of two quantities in ratio is called the quotient. The two quantities of a ratio are called the

terms of a ratio, such as "first term" and "second term". In a ratio 3

of

or 3:4, the first term is 3, and

4

4 is

4

the second term. In the ratio of

or 4:3, 4 is the

and 3 is the

3

.

FRAME NUMBER 18

LEVEL B

In a proportion

2 = 4

or 2:3 = 4:6. The 2 is called the first term of this

proportion, 3 the second

3

6

term, 4 the third term and 6 the fourth term. Then, in a proportion

2 = 4

or 2:7 = 4:14,

the second and

7

14

third terms are

and

; first and fourth terms are

and

.

FRAME NUMBER 31

LEVEL C

Type 3. The distance between two points on a map is 3.6 inches. The distance between the

1

same two points on the ground is 3,520 yards. What is the scale of the map? We say: scale =

=

X

l:X. 1 is to X as 3.6 inches is to 3,520 yards.

We write 1 =

3.6

. Complete the solution.

X

3,520 x 36

X=

Scale =

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