01:15
Adding Signed Numbers: Pairs of Numbers Whose Sum is Zero
This clip explains that any time we add 2 numbers with the same absolute value, but opposite signs, their sum will be zero.
01:49
Adding Signed Numbers: Adding Negative Numbers
This clip explains the rule for adding two negative numbers: to get the absolute value of the answer, add the absolute values of the addends. "As for the sign of the answer," the clip continues, "
it's the same as the sign of the addends."