Part 2/6:
Pedro went to the mall with R$50 and bought a snack costing R$18. How much money does he have left?
In this case, Pedro starts with R$50, and by subtracting the R$18 he spent, we perform the subtraction as follows:
- Calculation: 50 - 18
To ensure accuracy in our calculations, we align units with units and tens with tens—an essential aspect of positional number systems. Borrowing is often necessary when the top number is smaller than the bottom number, which can create confusion. This process involves "borrowing" from adjacent values, which we handle carefully.
When the calculation is completed, we find:
- Remaining Amount: R$32
This example highlights how subtraction is utilized to determine what remains after an expenditure.