4 years ago

Why do you change the sign when subtracting a negative number?

Mathematics

2 answers:

natulia [17]4 years ago

5 0

This is because minus times minus is equals plus so the sign must change

jeka57 [31]4 years ago

3 0

Suppose I am in debt to someone to the value of $5. Then we can say that my net worth is -5. Now my friend wants to help me out with my debt by 'taking away' the -5. He can do this by giving me $5 and now my debt is zero.

so we can say that these 2 are equivalent -5-(-5) = -5 + 5 = 0.

Hope this helps.

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