When ever your multiplying a number by 1 the answer is always going to be the other number NOT 1.
For example if I wanted to multiply 1x5 the answer would be 5.
This rule goes the same with every number your multiplying by 1.
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There aren't any differences.
numbers with Like signs : result Plusnumbers with Unlike signs : result Minus
you must take the sign of the bigger number
Multiplication signs probably. They can be represented by an "x". Plus signs also look like a cross, and are more horizontal "+".
"What is 3*(-5)" would be such a problem.