Solve the following subtraction problems, showing your work step-by-step: Problem 1: 538 - 189 Problem 2: 662 - 487

We cannot subtract 9 from 8, so we borrow from the tens place. The 3 in the tens place becomes 2. The 8 in the ones place becomes 18.

$$18 - 9 = 9$$

We cannot subtract 8 from 2, so we borrow from the hundreds place. The 5 in the hundreds place becomes 4. The 2 in the tens place becomes 12.

$$12 - 8 = 4$$

The 5 in the hundreds place became 4.

$$4 - 1 = 3$$

The result is:

$$\begin{array}{r} 538 \\ - \quad 189 \\ \hline \boxed{\textbf{349}} \end{array}$$

:

$$\begin{array}{r} 662 \\ - \quad 487 \\ \hline \end{array}$$

We cannot subtract 7 from 2, so we borrow from the tens place. The 6 in the tens place becomes 5. The 2 in the ones place becomes 12.

$$12 - 7 = 5$$

We cannot subtract 8 from 5, so we borrow from the hundreds place. The 6 in the hundreds place becomes 5. The 5 in the tens place becomes 15.

$$15 - 8 = 7$$

The 6 in the hundreds place became 5.

$$5 - 4 = 1$$

The result is:

$$\begin{array}{r} 662 \\ - \quad 487 \\ \hline \boxed{\textbf{175}} \end{array}$$