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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