Rules in operation with signed numbers?

Answer 1

I. Addition

1. Positive + Positive = Positive ( +3 PLUS +3 = +6)

2. Negative + Negative = Negative (-3 PLUS -3 = -6)

3. Positive + Negative OR Negative + Positive

Subtract the numbers then copy the sign of the number with greater value.

(+5 PLUS -3 = +2)

(-5 PLUS +3 = -2)

II. Subtraction

Change the sign of the subtrahend then the follow the rules of addition above.

Examples:

+5 MINUS -3 = +5 +3 = +8

+5 MINUS +3 = +5 -3 = +2

III. Multiplication

1. Positive x Positive = Positive (+3 times +5= +15)

2. Negative x Negative = Positive (-3 times -5 = +15)

3. Positive x Negative = Negative (+3 times -5 = -15)

4. Negative x Positive = Negative (-3 times +5 = -15)

IV. Division

Same rules as in multiplication

Note:

Like signs when multiplied or divided together = Positive

Unlike signs when multiplied or divided together = Negative