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### Course: Pre-algebra>Unit 3

Lesson 1: Intro to ratios

# Ratio review

Learn how to find the ratio between two things given a diagram.
A ratio compares two different quantities.
For example, those two quantities could be monkeys and bananas:
Notice that there are $4$ monkeys and $5$ bananas.
Here are a few different ways we can describe the ratio of monkeys to bananas:
1. There are $4$ monkeys for every $5$ bananas.
2. The ratio of monkeys to bananas is $4$ to $5$.
3. The ratio of monkeys to bananas is $4:5$.
Order matters in ratios. Here are a few different ways to describe the ratio of bananas to monkeys:
1. There are $5$ bananas for every $4$ monkeys .
2. The ratio of bananas to monkeys is $5$ to $4$.
3. The ratio of bananas to monkeys is $5:4$.

## Let's practice!

Problem 1
Dana loves rocks! She has $6$ pieces of granite, $3$ pieces of marble, $14$ pieces of sandstone, and $1$ piece of slate.
What is the ratio of pieces of sandstone to pieces of marble in Dana's collection?
Choose 1 answer:

## Want to join the conversation?

• Do you always need to simplify every ratio?
(322 votes)
• If the ratios can have a way of being simplified you should.
(214 votes)
• How do you compare two ratios? Well... let me tell you. There are still other ways to make the same comparison, by using equal ratios. To find an equal ratio, you can either multiply or divide each term in the ratio by the same number (but not zero). For example, if we divide both terms in the ratio 3:6 by the number three, then we get the equal ratio, 1:2.
(156 votes)
• You compare two ratios by using the butterfly method. If you dont know what the butterfly method is then you can you the criss cross method.
(44 votes)
• if you have 2 apples and 3 toys is the ration 2:3
(70 votes)
• you can also do it as a fraction
(52 votes)
• Why do ratios have olny two numbers
(48 votes)
• so they can compare both the numbers
(62 votes)
• How big can a ratio get?
(29 votes)
• A ratio is basically a comparison of two numbers and an ratio can get as big as ∞:∞, because after all a ratio is an comparison of two numbers and that is indeed endless.
(39 votes)
• Hey I have a question for you can you help me. Well what are the difference of a rate and a ratios I always get confused. Plz comment and help. thanks you
(25 votes)
• Hi 🤩SOPHIALIU🌸🌺

A rate is something that allows you to express one thing in terms of another thing, this is easiest to demonstrate with an example:

Imagine you are walking to the park, the park might be 100 meters away from your house, and it may take you 1 minute to get there, the rate associated with this problem would be 100 meters per 1 second (this is the rate you are travelling at and we may write this as 100m/1sec)

A ratio is very similar to a rate, we are comparing how an amount of one thing compares to an amount of another thing, again an example may be useful:

Imagine you are making chocolate milk (by mixing chocolate powder with milk), if you mix 2 spoons of chocolate powder in 1 glass of milk this will give you a ratio of 2 spoons of chocolate powder to 1 cup of milk (we might write this as 2:1, this is our ratio)
(40 votes)
• Can you have decimals in ratios?
(34 votes)
• yes a ratio can be 3.25 apples for every 6.64 bananas :)
(5 votes)
• Why in ratios do we use the : sign ratios.
(16 votes)
• Its a comparison symbol I'm assuming. You can search on Google for a specific answer to that.
(15 votes)
• What doesn’t make sense to me is that, someone explained to me that if there are 5 bananas and 5 apples, the ratio would be 1, because they are they same number so there would be 5 apples for every banana and the banana has 5 so that would be 1 but in this case would it be, 5:5?? (The way i said it is really confusing sorry)
(14 votes)
• Remember that ratios can be simplified, in the same way that fractions can be simplified (dividing each number by the same number).

From dividing each number by 5, we see that 5:5 simplifies to 1:1, or 1, just like the fraction 5/5 simplifies to 1/1, or 1.

Have a blessed, wonderful day!
(20 votes)
• is it okay to be learning this the summer before you go into 6th grade instead waiting for the school year to start?
(19 votes)
• It is. In fact, it could get you finishing school fast. (I'm doing it.)
(9 votes)