Subtracting Decimals to Spend Money

The video tutorial guides viewers through solving a standardized math test question involving the subtraction of decimals. The problem involves calculating how much money Lena has left after spending on cotton candy and a toy at the fair. The tutorial demonstrates the borrowing technique in subtraction, first subtracting $2.59 from $10 and then $3.49 from the remaining amount. The final answer is $3.92. The video concludes with encouragement to continue learning math.

Explain how borrowing works in subtraction as demonstrated in Lena's problem.

What is the final amount Lena had after purchasing both cotton candy and a toy?