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### Course: Staging content lifeboat>Unit 14

Lesson 34: Multiplying fractions and whole numbers

# Multiplying fractions and whole numbers 2

Sal multiplies 6 x 1/4 and supports the answer by drawing a fraction model. Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• why does 6 = 6/1
• It's easier to think of fractions as people with things. If you have 6 candy bars and you split them with JUST yourself, how many candy bars do you get to keep? 6 bars/1 person = 6 bars per person, which is just you. And if you had 6 candy bars for you and 5 friends, it is 6/6, which is 1 bar for you or 1 bar per person.
• This is not math related, but technical: How do I answer with a mixed number in the assignments? For example, it asks to represent 3.11 as a mixed number, but when I write 3+1/10+1/100, it tells me that I have too many characters. How do I fix this?
• to write a mixed number such as three and a half you write 3 space 1/2 and it looks like this 3 1/2
To write 3.11 as a mixed number first change the .11 to a fraction = it is 11/100, so 3.11 is written 3 11/100 with a space between the 3 and 11/100
You can also write the answer as an improper fraction - 3 1/2 becomes 7/2
3 11/100 becomes 311/100
Hope this helps.
• What os a mixed number or a whole
• a mixed number is 25 1/8 and a whole number is 25
• I really need help with multiplying fractions with whole numbers, and KHAN does not have any videos to help me with them! Please, can someone help me? It is a pain, because my math program is not teaching me it, but it is asking questions relating to them.Someone,please help fast -Thanks!,Corynn.
• Well, you just need to turn the whole number into a fraction. Okay, let's say I am multiplying 2 x 1/2; I would turn the 2 into a fraction by putting a 1 under the 2, like this, 2/1. That means it's 2 divided by 1 (which is 2). So now I have 2/1 x 1/2, now I would ask myself, what is 2 x 1? 2! The same equation is on the bottom, 1 x 2. 2! Now my answer is 2/2. So now if you want to convert that into a whole number, you do 2 divided by 2. Which is 1. So 1 is my answer!
• How is it a mixed number why is it called that
• Because it is written as a mix between a whole number and a fraction.
• how do you multiply
a mixed number by a whole number
• First start off by changing the mixed number to a improper fraction, so for example, 1 3/4 to 7/4. Now to give you an idea on how to do this let me give you an example. How to multiply 2 4/5 to 5? Well start off by changing 2 4/5 to an improper fraction, which is 14/5. So now 14/5 times 5 (or if you want to visualize this better you may write it as 5/1). So the numerator times the numerator will be 14 times 5, which makes it 70. Denominator times the other denominator makes it still 5, the answer will be 70/5. This can be simplified further to 14. Hope this helped!
• Why specifically do you have to divide while multiplying fractions and mixed numbers?
• please be more specific. multiplying by fractions is dividing by whole numbers. eg 2*1/2 is 4 (2 goes into a half four times) I'm not sure if that's what you mean?