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?

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How much money does Luca have before making the purchase?

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

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

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

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