Luis has a simple calculator that has buttons for the digits 0 through 9, each of the 4 basic operations (+,−×,÷), and an '=' button. Luis pushes a digit followed by the '+' sign, followed by another digit, followed by the '-' sign, followed by another digit and then the '=' sign. How many different answers could Luis get?

Question

anonymous · Answer

Biggest possible number you could get is 18 (9+9-0). The smallest is -9 (0+0-9). You can get every integer between these as well. So 28 different outcomes.