Numerical equations

Question

Chantal walked up 7 flights of stairs from the ground floor. Then, she walked back down to the ground floor. Use signed numbers to write a numerical equation that expresses this mathematically

Answer 1

Chantal walked up 7 flights of stairs. We can express that action as +7

 

She then walked down 7 flights of stairs. We can express that action as -7

 

We can consider both actions as +7 +(-7) = 0