Question

Explain how you can add on to find the differennce 727-685

Answer 1

You can do something call KCC. It means keep the sign of 727(which is positive) and change the - (Subtraction sign) to + (addition sign) and change again the positive 685 (685) to a negetive 685 (-685) so now the new equation is 727+(-685)=42 and 727-685=42

Explanation: