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## Pre-algebra

### Course: Pre-algebra>Unit 3

Lesson 5: Intro to rates

# Solving unit rate problem

Jayda delivers newspapers on her paper route, taking 3 hours to distribute 189 newspapers. To calculate her rate per hour, divide the total newspapers (189) by the hours taken (3). This results in Jayda delivering 63 newspapers per hour, showcasing her efficiency and speed. Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• Does anyone understand why Sal had to flip the 3/189 to 189/3 before he did the problem?
• Fractions is basically dividing.

For example 189/3 (improper fraction) = 189/3 <- Divide symbol "/" It's like simplifying it, 189/3 and 3/3 = 63/1. If he flipped it around to 3/189, then it would become smaller (3 hours for every 189 newspapers, or 3 divided by 189), simplified as 1 hour for every 63 newspapers (1 divided by 63), but it would be as decimal form if you divide it (1 divided by 63 and 3 divided by 189, both equals 0.0158730158730159, etc.) = 0.0158730158730159...(irrational number, random numbers forever going on, like pi). But if it was 189/3 (we are dealing with whole numbers) we can turn it into a mixed number: 3 can go in 189 "63" times perfectly, so 63 0/189. So that's how we got our answer. (Or 189 divided by 3, but the other way around. See how 189 divided by 3 (189/3) is different that 3 divided by 189? (3/189) ) Order matters.

I hope that made sense and helped you!
• Is 2:5 the same as 5:2
• The order of the #s matter.
If the problem were (for example) There are 15 kids who have pets in a class. There are 33 kids in the class. What is the ratio of kids who have pets to kids who do not? The answer would be . If you said you would be saying the ratio of kids who do NOT have pets to kids who DO have pets.
• Yes tis has helped me a lot now I will die as a happy man
• wow that doesn't sound good ur not old yet
• how do i solve a unit rate problem if there are fractions in them? For example, the unit rate of 2/3 cup of sugar for every 1/2 teaspoon of vanilla
• Divide 2/3 and 1/2. Do the same method even if it's a fraction.
• the audio is not good
• Youtube: We make unskippable two-minute ads in front of every video!
• what is math
• math is basically sufferage, pain, things we will never do in life, sometimes fun, and learning. lots and lots of learning.
• the ratios are the same with 5 apples and 6 banana too so it is it is still 5.6 or 6.5
• I don't understand these problems...

Fill in the blank with the unit rate:

240 km in 2.5 hours =____ km in 1 hour

Fill in the blank with the unit rate:

\$15 for 4 quarts = \$ for 1 quart

There are 25 computers in a math lab. There are 6 activity booklets for every 2 computers in the math lab. How many activity booklets are in the math lab?

There are activity booklets in the math lab.

You earn \$102 for doing 12 hours of yard work. Your friend earns \$120 working at a store for 15 hours.

How much do you earn for every hour of yard work? \$ per hour

How much does your friend earn each hour at the store? \$ per hour

What would YOU earn for 15 hours worth of yard work (at your hourly rate)? \$ for 15 hours of work