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# Multiplication as equal groups

Sal uses arrays and repeated addition to visualize multiplication.  Created by Sal Khan.

## Want to join the conversation?

• how do you multiply mills and thousands
• you can try converting the number so you only have to multiply the numbers with value example
12000*600 is the same as 1200000*6 then multiply what i'm trying to write is put the zeros behind the larger numbers but don't put numbers with value like 123456789......
• How to do you multiply hundreds and thousands?

For example 100x2000?
• Multiply the numbers without the zeros at the end, then place the total number of zeros at the end of the result.

In your example, do 1x2=2, then place a total of 2+3=5 zeros at the end. So 100x2000 = 200,000.
• haw do i get to fourth grade?
• its how not haw so u have to wait one year bro
• did you know any thing times eleven is it twise
like 7 times 9 is 77
• Yup, that’s right for single-digit numbers, but if you get to 10 or bigger it doesn’t work out. 10x11=110, not 1010. 11x11=121, not 1111.
Also, 7x9=63.

I hope this helps!
• I do know all my tables by heart but how do stick on to them
• Skip counting also helps. For example, I know 8x8=64 but if I forget how much 7x8 is, all I have to do is subtract 1 eight from 64.

Think about it: 8x8 is the same as 8 eights, so 7x8 is 7 eights. Therefore, 7x8 has 1 less eight than 8x8. So 7x8 is the same as 8x8 - 8, or 64 - 8. Which is 56.
• can you multiply fractions?
• who first used multiplication and in which country?
• The oldest known multiplication tables were used by the Babylonians about Iraq 4000 years ago . But he early Egyptians were the first to discover multiplication and to use it effectively as well as teach it to one another.
The modern method of multiplication based on the Hindu–Arabic numeral system was first described by Brahmagupta (598 - died after 665) was an Indian mathematician and astronomer.
Brahmagupta gave rules for addition, subtraction, multiplication and division.
• how much of this do we need to know?
• All of it. Someday you may need to use this, because we shouldn't depend on calculators.
• how would you multiply big numbers with out adding
• Multiply the number by how many times you see the same number appears.
Ex: 5+5+5+5+5+5+5=? 5*7=35