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### Course: Arithmetic>Unit 18

Lesson 9: Adding & subtracting integers

# Subtracting integers: find the missing value

Use number lines to find missing numbers in subtraction equations with integers. Arrows to the left equivalently mean adding a negative number and subtracting a positive number of the same magnitude. Arrows to the right equivalently mean adding a positive number and subtracting a negative number of the same magnitude. Created by Sal Khan.

## Want to join the conversation?

• -+-=-
-x-=+
why is this?
• You visualize it by taking a look at a number line. For the first example, say we start with -5 and then we add another -5. We would continue to move in the negative direction, therefore leaving us with a negative number, -10. For the second example, a negative times a negative will be a positive because the negatives cancel each other out.
• i kinda understand this
• I just use a math song my teacher taught me to solve equations using negative numbers.
• Here's a different song to help find Median, Mean, Mode, and Range... BTW

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Hey riddle riddle,
The median is in the middle
You add and divide for the mean
The mode appears the most
And the range is the difference in between

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Hope this helps! : D
• imagine having to draw a number line every time to find the answer...
(1 vote)
• Little to long khan academy. Rather practice than watch.
(1 vote)
• i don't get this video.
• Is anyone else confused on this?
• yes sirry
• `Yes that would be much easier`