Mental Math Subtraction (Example)

In this video, Luca is at a store wanting to buy a video game costing $58. He has $139 and needs to calculate how much money he will have left after the purchase. To simplify the subtraction, the numbers are adjusted: 139 is increased to 140, and 58 is increased to 59. The subtraction is then performed in two steps: first subtracting 140 from 139, resulting in 90, and then subtracting 9, leaving Luca with $81. This method demonstrates an easier way to handle subtraction by adjusting numbers.

How much does the video game that Luca wants to buy cost?

How much money does Luca have before making the purchase?

Explain how Luca can adjust the numbers to simplify his calculation.

What mathematical operation does Luca perform to find out how much money he has left?

What is the total amount of money Luca will have left after buying the video game?