Adding/subtracting negative numbers Khan Academy 498 09:16
Negative number word problems 1 Khan Academy 500 04:21
Why subtracting a negative is equivalent to adding a positive Khan Academy 540 01:32
Adding and subtracting negative number examples Khan Academy 533 04:06
Example: Adding integers with different signs Khan Academy 526 05:31
Example: Adding negative numbers Khan Academy 567 05:40
