RULES
A positive times a negative number makes a...
Negative
-7 + 12
5
2 - 3
-1
4 x (-2)
-8
6 / (-2)
-3
A negative divided by a negative equals a...
positive.
-12 + 4
-8
-10 - (-5)
-5
-1 x 4 x -8
32
-36 / (-6)
6
When adding numbers with the same signs you have to...
Example: (-) + (-)
find the sum and use the common sign.
-7 + (-7)
-14
3 - (-9)
12
5 x (-4) x (-2) x (-1)
-40
-81 / 3
-27
When adding numbers with different signs you have to...
Example: (+) + (-)
find the difference and use the sign of the "bigger" number.
10 + (-10) + (-10)
-10
-1 - (-12)
11
-12 x (-9) x 1 x (-1) x (-1)
108
144 / -12
-12
Subtraction is the same as...
Adding the opposite!
-6 + 4 + (-3) + 9
4
10 - (-10) - 5
15
-12 x (-1) x (-2) x 6 x (-1) x (-1)
-144
-132 / -11
12