In order to understand how addition and subtraction of negative numbers works, we will use two color counters. We let a blue counter represent a positive number and a red counter will represent a nega...In order to understand how addition and subtraction of negative numbers works, we will use two color counters. We let a blue counter represent a positive number and a red counter will represent a negative number. When the numbers' signs are the same, the counters would be all the same color, so add them together. When the numbers' signs are different, some counters would make neutral pairs, so subtract them to see how many are left.
