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# Subtracting different ways

Sal subtracts numbers using models and number lines.   Created by Sal Khan.

## Want to join the conversation?

• do yuu alwayss subtract negative numbers
• Here is what works for me. Subtracting a negative number is the same as adding a positive number. The minus signs cancel each other out. For example 6-(-2) is the same as 6+2. Either way the answer is 8.
• What is 3-5 equal to?
• The way I solve this type of problem is I ask myself "well, what does 5-3 equal to?",
Then I say "oh, that's easy, 5 - 3 = 2".
But wait, that wasn't the question, the question was 3 - 5 =?
This may be a helpful trick:
when you have "smaller number - larger number" it's the same thing as
" - (larger number - smaller number)".
So if the question is 7-8=? we say that that is the same thing as " -(8-7)", so 7-8= -(8-7) = -1
I hope that this is helpful to whoever is reading this 2 years after the original question was asked lol...
• How do you multiply with negative numbers?
• The same as positive, if you multiply a negative by a negative the result is positive. You would treat them as if they are positive.
• I dont get negetive numbers can someone help me?
• A negative number is just a number that has less value then 0. -1 -2 -3 ect.
(1 vote)
• Isn't subtracting negative numbers pretty much the same as adding positive numbers?
• Subtracting negative numbers produces the same result as adding positive numbers, yes.

Adding negative numbers produces the same result as subtracting positive numbers too.
• And how do you subtract negatives????
• its the same as subtracting negative see 6 - 1 = 5 -6 - -1 = -5
• when subtracting decimals, do you have to line them up????
• Yes you have to. And Lucian Alekzander LaCroix, No swearing in any manner please
(1 vote)
• What is nine hundred billion divided bytwo?
• That is way to hard if you don't have paper!