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Lesson 1: Intro to fractions

# Intro to fractions

Sal divides wholes into equal-sized pieces to create unit fractions. Created by Sal Khan.

## Want to join the conversation?

• Burger
• Sam where are you
• I dont understand fractions because how is it that if you add 1/4+1/4 you get 1/2 the number is now shorter
• Let's see if I can clear this up for you. If you have a pizza, and you cut that pizza into four big slices, each slice is 1/4 of a pizza. Now, here's where you might have been confused. 2 of those 4 slices is the same as 1/2 of a pizza. 1/2 is the same as 2/4. If you had only cut the pizza in half, you would have 2 equal halves. I hope this was helpful, because I know how it is to be confused by fractions.
• Can every shape represent unlimited fractions?
• yes since you can always divide it further into more parts.
• Why isnt it 3 fourths instead of 1 fourth.. because one is shaded.. and 3 arent.
• When he shaded it, he meant it like he was taking away
• How will you be able to do 3x5 4/8?
Please tell me when you can!
• We can reduce 4/8 to 1/2, so the problem is 3 x 5 1/2.

Five 3’s are 15, and half of a 3 is 1 1/2. So we add 15 and 1 1/2 to get the final answer 16 1/2.

Have a blessed, wonderful day!
• At , why did they use the shapes a rectangle and a square?
• Since both squares and rectangles have congruent (similar) sides, then they can be easily cut into integer (whole number) pieces that make it easier to understand in terms of the overall lesson.
• Hi, this isn't about the video, but is it possible to see a lesson about probability somewhere? I would like to know what or means in probability.
• So on that last triangle with a shaded part that is not equal, what would it be?