Tylishia says that she can solve 324-197 by adding 3 to both numbers and solving 327-200 instead
a draw a number line (which needs not be perfectly to scale) to help you explain why Tylishia's method is valid.
b. Explain in another way why Tylishia's method is valid.
C. Could you adapt Tylishia's method to other subtraction problems, such as to the problem 183-49? If so, give at least two more examples and show how to apply Tylishia's method in each case.