Rita is given this problem:
Zetta has $39, but she needs $78 to buy a jacket she wants. How much more does she need?
Rita's replies, "79 minus 40 is 39, so she needs $39."
Explain Rita's reasoning. What is your reaction to this method of doing the problem?

Question

Quizplus · Accepted Answer

The Answer of Rita is given this problem:
Zetta has $39, but she needs $78 to buy a jacket she wants. How much more does she need?
Rita's replies, "79 minus 40 is 39, so she needs $39."
Explain Rita's reasoning. What is your reaction to this method of doing the problem?

Rita Is Given This Problem