4. Ratios
A ratio is a way to compare two or more
numbers
Ratios can be written as:
1). 2 numbers separated by a colon :
2). A fraction
3). With the word “to”
ratio
rate
ration
rational
unit rate
6. Types of Ratio Comparisons
Part to Part
The ratio of strawberries to
oranges is 2 to 3.
The ratio of oranges to
strawberries is 3 to 2.
7. Types of Ratio Comparisons
Part to Whole
The ratio of kittens to total pets
is 3 to 8.
The ratio of puppies to all pets
is 5 to 8.
8. Ratio Examples
Ratio of squares to circles is 3/6
Ratio of squares to circles is 3 to 6
Part to
Part
Ratio of squares to circles is 3:6
Ratio of squares to total figures is 3:10
Ratio of circles to total figures is 6/10
Part to
Whole
10. proportional
As one number or shape increases, the
other number or shape increases by
the same ratio
1/2
2/4
3/6
4/8
11. Proportions
Testing Proportions to see if they are
equivalent
Cross Multiply
to see if they
are equal
18
2
6
18
3
9
If they are the
same, they are
equivalent AND
proportional!
Use cross multiplication to test
proportions if you are given 2 fractions (or
more)
21. Ratios
Proportions
A
is a way to
compare
or more
numbers.
Ratios can be written as:
1) 2
separated
with a
(:)
Proportions are two
equivalent ratios.
Proportions are written as p
a r t to w h o le.
2) A
3) with the word
When given 2 proportions:
ratio of
to
is 3/6
ratio of
to
is 3 to 6
ratio of
to
is 3:6
Ratio of squares to
total figures is
When solving for an unknown:
Percents
Percent means parts
per
100, and tells you a ratio "out of
100"