How do we subtract negative numbers
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The Rules:
Rule Example
+(+) Two like signs become a
positive sign 3+(+2) = 3 + 2 = 5
−(−) 6−(−3) = 6 + 3 = 9
+(−) Two unlike signs become a negative sign 7+(−2) = 7 − 2 = 5
−(+) 8−(+2) = 8 − 2 = 6
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《《 Subtracting negative numbers 》》
subtracting a number is a same as adding the opposite of the number
let's look at the examples
- 5 - 7 = -5 + (-7)
10- (-3) = 10 + 3
Note : in the both example, we can change the subtraction into addition and change the sign of the second number to the opposite sign.
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