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# Multiplying 2-digit by 2-digit: 23x44

Learn to multiply two-digit numbers.  In this video, we will multiply 23 times 44. Created by Sal Khan.

## Want to join the conversation?

• if i am multiplying by one digit numbers how do i divide to check my answer?
• you can also do that 9 x 9 =81 or if you want 81 = 9/81 = 9
• if im multipling by one digit how can i divide to check my answer
• Well, I suppose you would divide by one of the digits you multiplied by? 5*4=20. Check:20/4=5. Something like that.
• compute? very safisticated word what does it mean?
• In this context, the word "compute" means determining/finding the result by mathematical means. Or to put it a different way, you work out a problem's solution using calculation.
• Can I Divide To Check My Answer?
• Yes, you can because division and multiplication are like addition and subtraction; you can use one to check your answer.
(1 vote)
• Doesn't of also mean to multiply
• How would solve this problem 55 time 11 cause I'm coming up with 650
• 55 times 11 is actually 605. When multiplying by 11, always multiply by 10 first and then add the number to your answer. i.e. 55 X 11 = (55 X 10) + (55 X 1)
(1 vote)
• why can i not understand ?
• So, if you get a problem with 3 numbers you would just have more zeros, right?
• Assuming you mean three digits in the bottom row then yes you'd add two zeros when you got to the third digit because at this point you know your answer will be a multiple of 100.
(1 vote)
• why do they put (23)(44)?
• Sal answers your question in the first part of the video, at , when he says, "This could have also been written as 23 times 44, or they could have written it as 23 in parentheses times 44, so you just put the two parentheses next to each other. That also implies multiplication."

They put (23) next to (44) without the multiplication symbol in between them because the brackets/parentheses actually mean multiplication already.

If you put a number inside a bracket, what you are saying is also equal to that number times 1.
(23) is the same as 1(23) or 1 x 23
(44) is the same as 1(44) or 1 x 44

If you put another number outside the bracket without an operation symbol like division or addition, whether that number is in its own bracket or not, then what you are saying is to multiply the number inside the bracket by the number outside the bracket.
23(44) is the same as (23)(44) or 23 x 44

This is covered in more detail when you start learning Algebra.
(1 vote)
• I'm not asking a question but sharing advice, the multiply sign has about 3 different symbols,a dot,the * sign,and the native X sign. Just for all yal who don't know.