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Multiplying 2-digit by 2-digit: 36x23

Learn to multiply two-digit numbers.  In this video, we will multiply 36 times 23. Created by Sal Khan.

Want to join the conversation?

• what if you multiply negative numbers what will happen?
• Well, you just need to multiply the numbers regularly but in you answer write either a negative or a positive sign before your product.
A negative * a negative = a positive
A negative * a positive = a negative
A positive * a positive = a positive
• Why did you put the numbers on the side?
• to make it more easy to visualize it
• Why do you carry in multiplication?
• When you "carry" you are taking a group of 10 ones and making them into 1 in the 10s place. It's basically because the place value is overfull.
• what is infinity times infinity??
• This is an excellent question and one that you'd want to have a lot of math under your belt to fully understand. Search the internet for "different kinds of infinity" or "orders of infinity".

The simplest illustration of an order of infinity is comparing counting numbers (1,2,3...) which are infinite to real numbers, which have an infinite number of numbers between each counting number.

Georg Cantor is the mathematician who formalized this concept.

Again, there's more math there than you're probably ready for, but it is a great question. Keep thinking about those type of questions as you learn more!
• What would happen if you multiply negatives?
• also if you multiply a negative by a positive you will get an negative.
• What about if I multiply 70*42? My product I got was 2,940. Is that right?
• Hi,

I'm never able to find captions for the videos. Am I missing something? I love Khan academy, but my deaf students need captions. Thank you!
• There's a button on the bottom-right corner of the video that says "CC" on it. AKA Closed Captions. Press it and you get subtitles.
• What if you multiply infinity with another number?
• you get infinity cause when you multiply a number by zero you get zero so think of it like zero.the number does not matter, it gets blocked out cause infinity is SO big.did i help?
• When you multiply 77 x 77 =539 couldn't you just use the same numbers when you add all together like 77 x 77 =539
• If you wanted to do a some-what shortcut way to multiply in 77 * 77, you would say:
`` 77 * 7 = 539 ``

Then, knowing that the next level of multiplication will give you the same thing, you can add 539 to 5390 (you always have to include that zero because of the position the position the 7 is in for the 2nd round of multiplication).
So... in the end you would get:
`` 5390 + 539 = 5929 ``

Hope this helped!
Sylvia.