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How can you subtract 45 from 22?

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1 Answer

Adding a negative number is the same as subtracting a positive number:
 
22 + (-45) = 22 - 45 = -23
 
Another way to think of it is to factor out a -1:
 
22 - 45 = -1*(45 - 22) = -1(23) = -23
 
A third way to think of it:
 
45 = 22 + 23, so
 
22 - 45 = 22 - (22+23) = (22-22)-23 = 0-23 = -23

Comments

Good answer! I like that you explained it multiple ways since this is a difficult topic when it's first introduced.