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Lesson 2: Multi-digit multiplication

Multiplying 2-digit numbers

Learn to multiply two-digit numbers.  In this video, we will multiply 36 times 27. Created by Sal Khan.

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• Isn't multiplication repeated addition? I don't understand it that well
• Multiplication is also repeated Addition for example:
2 * 6 = 12 or 6 + 6 = 12,
5 * 10 = 50 or 10 + 10 + 10 + 10 + 10 = 50.
(* is multiplication)
• when will i get to not go to school
• maybe on the weekends
• so guys
you always put a zero at the end of every number becuase if you don't put one you'll get it wrong
• so your saying 7x3=180? ye it isn't the answer and doesn't make sense so you don't always put a zero at the end
• i am still working on times, i mean i know some stuff but really in mosty bad.
so just saying this vid really helped.
thanks
• would you like help?
• i have a question it mike have 500 candy but he needs 5000 times so what it = to
• wait what
• what is 100x200
• You could also use powers of ten!
• can you use parentheses tog answer a multi digit multiplication question
• What would happen if you didn't put the zero in?Would the answer still be the same?
• You mean when you do the adding part?
As long as you keep a space there to account for place value then you don't need the zeros. The zeros are just to make it absolutely clear that your numbers are all in the right right place value.
The rest obviously require zeros to make it the right answer!