same trick as always add the two together and divide by 2 (adding a negative is the same as taking away) so (20-15)/2 or 2.5
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(10-20)/2 = -10/2 = negative 5
15
17.5 It is 2.5 more than 15 and 2.5 less than 20 To find a halfway point (which is also the average), add the numbers together and divide by 2.
-5 It is 15 more than -20 and 15 less than 10 To find a halfway point (which is also the average), add the numbers together and divide by 2. -20 + 10 = -10 and -10/2 = -5
Negative 15 minus 5 can be solved by subtracting 5 from -15. This results in -20, as subtracting a positive number from a negative number increases the magnitude of the negative value. In mathematical terms, -15 - 5 = -20.