Mr. Feliz
How to subtract signed numbers
 
By Mr. Feliz
 
Rule:
 
Change the sign of the number you are subtracting and then follow the rules for addition of signed numbers. 
 
Sample A:
 
10 - (-5) =
 
We change -5 to +5 and the problem from subtraction to addition.
 
10 - (-5) becomes 10 + (+5) = 15
 
Sample B:
 
-14 - (-15) =
 
We change -15 to +15 and the problem from subtraction to addition.
 
-14 - (-15) becomes -14 + (+15) = 1
 
Sample C:
 
-12 - (+3) =
 
We change +3 to -3 and the problem from subtraction to addition.
 
-12 - (+3) becomes -12 - 3 = -15
 
Practice Questions:
 
(1) 50 - (-60) =
 
(2) -25 - (-12) =
 
(3) -100 - (+56) =
 
(4) 60 - (+70) =
 
(5) 500 - (- 70) =
 
 
 
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