Ratio and Rates. 3.8. Objective- To compare ratios and rates. Ratio -. A comparison of two whole numbers in the same units. 5 girls to 7 boys. 4 Possible Ways to Write a Ratio. sometimes. 5 out of 12. as in 5 girls out of 12 students. Simplify each ratio below:. 1). 4). 2). 5).
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A comparison of two whole numbers
in the same units.
5 girls to 7 boys
4 Possible Ways to Write a Ratio
sometimes . . .
5 out of 12
as in 5 girls out of 12 students
- a comparison of two
whole numbers in the
- a comparison of a number
to one in different units.
- always written as a single
number on a per unit basis.
- always written as two
- never write the units.
- always write the units.
- reduce to simplify.
- divide to simplify.
1) 84 students in 4 classrooms
2) $30 for 8 lunches
3) 15,000 cars sold by 2000 dealers
8 oranges for 2 dollars
$87.50 for 5 tickets
The actual distance between North Chicago and Waukegan is 4 mi. What is the distance between these two locations on the map?
Write the scale as a fraction.
Let x be the map distance.
18x = 4
Use cross products to solve.
x ≈ 0.2
The distance on the map is about 0.2 in.
Your heart beats 70 beats/min. How many
beats per hour is this?
Joe reads 12 pages per day. How long
would it take him to read a 684 page book?
The world record for the 100 yard dash
is 9.4 seconds. How fast is this in miles/hr?