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### Course: Arithmetic (all content)>Unit 3

Lesson 1: Multiplication intro

# More ways to multiply

Sal uses arrays and repeated addition to multiply.  Created by Sal Khan.

## Want to join the conversation?

• hi sal, ive learnt soo much from you, I'm not that good with math but after joining khan academy I know how to multiply 10s, 100s, ect. add, subtract, and decimals, but I am really struggling to memorise the multiplication table, any tips?
• well write it down a few times that is how i learned it.
• What if you have 0 group
• Its just 0 because that is kind of like a 0
• can anyone multiply 10000x10000?
• yes. first, take off the 0`s (you will need them in step 3 of 4)second, multiply the numbers you got from step 1(1*1=1)third, add the 0s like so:4 0s+4 0s=8 0s.(00,000,000.)lastly link the 0s back on and tadaa! also the answer is 100,000,000, or 100M
• what if you don't know how to skip count by 8 than what do you do?
• Remember that 8 is the same as 2 groups of 4. (8 = 2 x 4) If you can't count by groups of 8, try counting by groups of 4. If that is still too hard, try counting by groups of 2 and work your way up to counting by larger numbers.
(1 vote)
• what is 1000 x 2000?
• 2M but I like your way of thinking "Look at me, I'm so smart!"
• so addition and multiplication are similar in a way. but what about subtraction and division? do they have some relation with each other like the others?
(1 vote)
• No, multiplication is the opposite of division, and thats the only relation I know about division
sorry if this didnt help