Rule:

1) If the signs are the same, we add the digits & keep the common sign.

ex) (-3) + (-8) = 11

Both are negative

ex) 8+5 = 13

Both numbers are

positive

2) If the signs are different, we subtract common digits and keep the sign of the larger digit.

ex) (-7) + 11 = 4

“11” is the larger

digit, so the sum

“4” is positive

ex) (-19) + (6) = -13

Larger number is

negative, so the

sum is negative

ex) (-3)+(7)+(-11) = -7

(-14)+(7)

ex) 7/10 + (-2/5)

7/10 + (-2/5*2/2)

7/10 + (-4/10) = 3/10

You can also see the above example like this: 7+(-4)/10 = 3/10

ex) -50 + (-7/9) + 35 + (-11/9)

-15 + (-18/9)

-15 + (-2) = -17

This makes my old brain hurt