Question

7495 - 577 ?

Explanation:

Step1: Subtract the units digit

$$\begin{align*} 5 - 7& \text{ (borrow 1 from tens digit)}\\ 15-7&=8 \end{align*}$$

Step2: Subtract the tens digit (after borrowing)

$$\begin{align*} 9 - 1-7&=1 \end{align*}$$

Step3: Subtract the hundreds digit (borrow 1 from thousands digit)

$$\begin{align*} 4 - 1-5& \text{ (borrow 1 from ten - thousands digit)}\\ 14 - 1-5&=8 \end{align*}$$

Step4: Subtract the thousands digit (after borrowing)

$$\begin{align*} 7 - 1-0&=6 \end{align*}$$

Answer:

$6918$