After all the videos I still don't understand.Please make it more clear

i will show you how to do it. example: 2/5 x 7/9. multiply the numerators and denominators, like this: 2x7=14, and 5x9=45. so the answer is 14/45

Could you show me how it is done

1. Convert a mixed fraction to an improper fraction. 2. Multiply the numerator by each other, and this is the answer's numerator. 3. Multiply the denominator by each other, and this is the answer's denominator. 4. Simplify the fraction by dividing the result's numerator and denominator by their GCD. For example, (7 / 2) * (15 / 7) Numerator multiplied: 7 * 15 = 105 Denominator multiplied: 2 * 7 = 14 Our resultant fraction: 105 / 14 GCD of 105 and 14 is 7, so we divide numerator and denominator by 7. (105 / 7) / (14 / 7) = 15 / 2

What are "energy points" for?

Energy points measure effort on Khan Academy. Learners earn more energy points by pushing the edge of their knowledge. They are not a measure of mastery or ability. You can unlock new avatars with energy points. Check out Learner Home > Click on your avatar https://support.khanacademy.org/hc/en-us/articles/202487710-What-are-energy-points-badges-and-avatars

7 divided by 21 equals 3?

No. The order of division is important. While it is true that 21 divided by 7 is 3, 7 divided by 21 is the fraction 7/21, which reduces to *1/3*. Think about this: if 7 pizzas are equally divided among 21 people, each person would get *less* than a whole pizza because the number of pizzas (7) is less than the number of people sharing them (21). Clearly each person would not get 3 whole pizzas.

Main content

Course: Grade 5 math (FL B.E.S.T.) > Unit 6

Lesson 6: Multiplying fractions word problems

Multiply fractions: FAQ

Google Classroom

Frequently asked questions about multiplying fractions.

How do we multiply fractions and whole numbers visually?

There are many different ways to multiply fractions visually. We can use area models, groups of objects, tape diagrams, or number lines. All of these methods help us to see how the multiplication works.

For example, we can use a number line to show how we multiply

\frac{4}{5} \times 10

by drawing a number line from

0

10

and then splitting the number line into

5

equal parts.

Next, we can find

\frac{4}{5}

10

on the number line by counting

4

lengths of

2

So,

\frac{4}{5} \times 10 = 8

Try it yourself with these exercises:

What are the strategies we can use to multiply fractions by fractions?

Just like multiplying fractions and whole numbers, we can use different visuals to help us multiply fractions. Some popular strategies are using area models, tape diagrams, or number lines.

We can use an area model to multiply

\frac{3}{10} \times \frac{1}{4}

. First, we can create a striped rectangle by multiplying its

width \times height

The striped rectangle would show

\frac{3}{10}

of a unit wide and

\frac{1}{4}

of a unit high. The amount overlapping would be our product. In this example, the product is

\frac{3}{40}

Try it yourself with these exercises:

How do we multiply mixed numbers?

To multiply mixed numbers, we can convert them to improper fractions and then multiply the fractions as we normally would. For example, to multiply

1 \frac{1}{2}

2 \frac{1}{4}

, we first convert them to improper fractions:

\frac{3}{2} \times \frac{9}{4}

. Then, we multiply the numerators and denominators:

\frac{27}{8}

Try it yourself with this exercise:

Multiply mixed numbers

How do we find the area of rectangles with fraction side lengths?

To find the area of any rectangle, we can multiply the length times the width. If the rectangle has fractional side lengths, we multiply the two fractions together.

For example, to find the area of a rectangle with side lengths

\frac{1}{2}

and

\frac{2}{3}

, we multiply

\frac{1}{2} \times \frac{2}{3} = \frac{2}{6} = \frac{1}{3}

Try it yourself with this exercise:

Area of rectangles with fraction side lengths

Why do we need to learn how to multiply fractions?

Multiplying fractions is a key skill in math that you'll use throughout your academic career and in the real world. For example, if you need to scale a recipe up or down, you might need to multiply fractions in order to adjust the quantities of the ingredients.

Want to join the conversation?

Sort by:

penelope
Posted 3 months ago. Direct link to penelope's post “After all the videos I st...”
After all the videos I still don't understand.Please make it more clear
Button navigates to signup pageComment on penelope's post “After all the videos I st...”
(5 votes)
Answer
- surajdharan.sr71
  Posted 2 months ago. Direct link to surajdharan.sr71's post “i will show you how to do...”
  i will show you how to do it. example: 2/5 x 7/9. multiply the numerators and denominators, like this: 2x7=14, and 5x9=45. so the answer is 14/45
  Button navigates to signup page
  (2 votes)
Satya SreehaasM
Posted 2 months ago. Direct link to Satya SreehaasM's post “Could you show me how it ...”
Could you show me how it is done
Button navigates to signup pageButton navigates to signup page
(2 votes)
Answer
- joshua
  Posted 2 months ago. Direct link to joshua's post “1. Convert a mixed fracti...”
  1. Convert a mixed fraction to an improper fraction.
  
  2. Multiply the numerator by each other, and this is the answer's numerator.
  
  3. Multiply the denominator by each other, and this is the answer's denominator.
  
  4. Simplify the fraction by dividing the result's numerator and denominator by their GCD.
  
  For example, (7 / 2) * (15 / 7)
  
  Numerator multiplied:
  7 * 15 = 105
  
  Denominator multiplied:
  2 * 7 = 14
  
  Our resultant fraction: 105 / 14
  
  GCD of 105 and 14 is 7, so we divide numerator and denominator by 7.
  (105 / 7) / (14 / 7)
  = 15 / 2
  Button navigates to signup page
  (2 votes)
rtbenham
Posted 8 months ago. Direct link to rtbenham's post “Basically your multiplyin...”
Basically your multiplying the fractions instead of dividing?
Button navigates to signup pageButton navigates to signup page
(2 votes)
Answer
- Splatowan
  Posted 3 months ago. Direct link to Splatowan's post “Yes, it wants you to divi...”
  Yes, it wants you to divide, but it's multiplying, Kinda. It's confusing at the start.
  Comment on Splatowan's post “Yes, it wants you to divi...”
  (1 vote)
fmoon27
Posted a month ago. Direct link to fmoon27's post “What are "energy points" ...”
What are "energy points" for?
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer
- joshua
  Posted a month ago. Direct link to joshua's post “Energy points measure eff...”
  Energy points measure effort on Khan Academy. Learners earn more energy points by pushing the edge of their knowledge. They are not a measure of mastery or ability.
  
  You can unlock new avatars with energy points.
  Check out Learner Home > Click on your avatar
  
  https://support.khanacademy.org/hc/en-us/articles/202487710-What-are-energy-points-badges-and-avatars
  Button navigates to signup page
  (2 votes)
Slurp juice
Posted 5 months ago. Direct link to Slurp juice's post “7 divided by 21 equals 3?”
7 divided by 21 equals 3?
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer
- Ian Pulizzotto
  Posted 5 months ago. Direct link to Ian Pulizzotto's post “No. The order of divisio...”
  No. The order of division is important. While it is true that 21 divided by 7 is 3, 7 divided by 21 is the fraction 7/21, which reduces to 1/3.
  
  Think about this: if 7 pizzas are equally divided among 21 people, each person would get less than a whole pizza because the number of pizzas (7) is less than the number of people sharing them (21). Clearly each person would not get 3 whole pizzas.
  Button navigates to signup page
  (3 votes)
maeve.butler-mcphee
Posted a month ago. Direct link to maeve.butler-mcphee's post “I don't understand the vi...”
I don't understand the videos and the question that says:

This is a square.

Thank you for that ground breaking information. I seem to have thought it was a circle. Thanks for clearing that up.
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer
Dragon2013
Posted a month ago. Direct link to Dragon2013's post “what are energy points fo...”
what are energy points for?
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer
AlexaE
Posted 22 days ago. Direct link to AlexaE's post “I kinda get it”
I kinda get it
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer
🤑GreenChipzThatRSpicy🔥
Posted 15 days ago. Direct link to 🤑GreenChipzThatRSpicy🔥's post “Thanks bro why did this h...”
Thanks bro why did this help so much!
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer
Soleil
Posted a month ago. Direct link to Soleil's post “What if i'm already so go...”
What if i'm already so good at fractions that I don't even need to do Khan Academy?
Button navigates to signup pageButton navigates to signup page
(1 vote)
Answer