Notes
Ratios
A __________________ is a comparison of two numbers.
A ratio may be written in THREE ways:
as a _____________________________ (
7
10
)
using a ____________________________ (7:10)
in ___________________________ (7 to 10)
**Simplify ratios, but DO NOT change improper fractions into mixed numbers.
Find the ratio of teachers to
students in the classroom.
Find the ratio of males to
females in the classroom
Find the ratio of males to the total
number of students in the room.
Comparing Ratios
To determine if two ratios are equivalent (equal), cross multiply.
If the products are the same, they ratios are equivalent!
1
12
12
32
3
7
4
9
2
24
15
40
4
12
5
11
Determine if the following ratios are equivalent.
1)
2
3
and
12
20
2) 12: 84 and 24: 168
3)
3
15
and
4
20