Is this math list correct?

Question

negative / negative = positive
negative x negative = positive
negative - negative = positive
negative + negative = positive
positive / negative = negative
positive - negative = negative
positive + negative = negative

Answer 1

The multiplication and division ones are right.

You can't come up with rules like that for addition and subtraction, unfortunately, in general.

The only ones that you could be sure of are:

positive + positive = positive
positive - negative = positive
negative + negative = negative
negative - positive = negative

Counter-examples:

"negative - negative = positive": sometimes true, but -9 - (-5) = -4
"negative + negative = positive": this is ALWAYS wrong, see above. -5 + (-4) = -9
"positive - negative = negative": this is ALWAYS wrong, see above. 5 - (-4) = 5 + 4 = 9
"positive + negative = negative": sometimes, true, but 9 + -5 = 4

neg + neg = neg
neg + pos = either
pos + neg = either
pos + pos = pos

neg - neg = either
neg - pos = neg
pos - neg = pos
pos - pos = either

pos × pos = pos
pos × neg = neg
neg × pos = neg
neg × neg = pos

pos ÷ pos = pos
pos ÷ neg = neg
neg ÷ pos = neg
neg ÷ neg = pos

Answer 2

Almost

* negative / negative = positive (-5)/(-1) = 5
* negative x negative = positive (-9)*(-2) = -18

X negative - negative = option 1) the first number is greater than the second then the rest will be negative e.g. (-10)-(-5) = -10+5 = -5
option 2) the first number is less than the second then the rest will be positive e.g. (-5)-(-10) = -5+10 = 10-5 = 5

* negative + negative = negative (-5)+(-6) = -5-6 = -11
* positive / negative = negative 5/(-1) = -5
* positive x negative = negative 9*(-2) = 18
* positive - negative = positive 5-(-2) = 5+2 = 7

X positive + negative; again has two posible results. Option 1) if the positive number is larger than the negative the sum is positive e.g. 8+(-2) = 8-2 = 6
Option 2) if the negative number is larger than the positive the sum is negative e.g. 4+(-6) = 4-6 = -6 + 4 = -2

Answer 3

1. negative / negative = positive > correct

2. negative x negative = positive > correct

3. negative - negative = positive > incorrect
Example:
-7 - (-2) = - 7 + 2 = -5
This answer is negative because of the numbers: a large negative number dominates over the small, positive number.

4. negative + negative = positive > incorrect
Examples:
-7 + (- 4) = -11
- 9 + (-2) = - 11

5. positive / negative = negative > correct

6. positive - negative = negative > incorrect
Examples:
10 - (-2) = 10 +2 = 12
5 - (-4) = 5 + 4 = 9

7. positive + negative = negative > incorrect- it depends on the numbers your using
Examples:
4 + (-2)
4 - 2 = 2

14 + (-17) = -3

5 + (-5) = 0

Answer 4

No

negative - negative may be either. Consider (-3) - (-1) = -2

negative + negative is always negative

positive - negative is always positive

positive + negative may be either. Consider (5) + (-3) = 2

In the two "either" cases above, the general rule is that the result will take on the sign of the number of greater magnitude.

Answer 5

negative / negative = positive = correct
negative x negative = positive = correct
negative - negative = positive = correct only if 1st # < 2nd #
negative + negative = positive = never correct
positive / negative = negative = correct
positive - negative = negative = never correct
positive + negative = negative = correct only if 1st # < 2nd #

Answer 6

negetive-negetive may be positive or negetive
-5-(-7)=+2
-5-(-2)=-3
-5+-5=-10 always neg+neg=neg

positive - neg = pos.

5-(-5) = 5+5=10

last one varies acc. pos value is greater or neg value

Answer 7

the mutli and division are right
the adding and subtracting is wrong
ex. postive + negative = negative
10 + (-5) = 5

Answer 8

multiplication and divison are right
for addition and subtraction depends on the values
the answer will carry the sign of the larger number

Answer 9

neg-neg=pos
neg+neg=neg
pos-neg=pos
pos+neg=pos

the other 4 are correct