Adding/subtracting negative numbers Khan Academy 527 09:16
Negative number word problems 1 Khan Academy 520 04:21
Why subtracting a negative is equivalent to adding a positive Khan Academy 566 01:32
Adding and subtracting negative number examples Khan Academy 557 04:06
Example: Adding integers with different signs Khan Academy 548 05:31
Example: Adding negative numbers Khan Academy 585 05:40
