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Lesson 1: Multi-digit multiplication: place value and area models

# Multiplying with area model: 78 x 65

Sal uses an area model to multiply 78x65. Created by Sal Khan.

## Want to join the conversation?

• if you do 78 times 65 and then 65 times 78 will you get the same answer?
• 78*65=5070
65*78=5070
78*65=65*78
You will get the same answer because of the commutative property of multiplication.
• at he says "i just made it a little more explicit" what does that mean in math?(i know it does not mean what it normally means)
• According to the Merriam-Webster dictionary, explicit means "fully revealed or expressed without vagueness, implication, or ambiguity : leaving no question as to meaning or intent".
Basically, he's saying that he made it easier to see; in this use, it's just a general phrase, not a math one.
• all you have to do is multiply the numbers then you add then all up and you get your answer its that easy
• What are factors
• Factor, in mathematics, a number or algebraic expression that divides another number or expression evenly—i.e., with no remainder. For example, 3 and 6 are factors of 12 because 12 ÷ 3 = 4 exactly and 12 ÷ 6 = 2 exactly. The other factors of 12 are 1, 2, 4, and 12.
• sal how do this stuff are you really good at it
• he smat
• my mom said please make this easily pls
• Same pinch red cross
• sal your videos are the best
• make this easer