Solve the following subtraction problems.

Here are the subtraction problems:

• a) Subtract 4,573 from 9,013.

  $$9,013 - 4,573$$ $$\begin{array}{r} 9013 \\ - 4573 \\ \hline 4440 \end{array}$$

  The difference is $\boxed{\text{4,440}}$.

• b) Subtract 2,518 from 8,740.

  $$8,740 - 2,518$$ $$\begin{array}{r} 8740 \\ - 2518 \\ \hline 6222 \end{array}$$

  The difference is $\boxed{\text{6,222}}$.

• c) Subtract 4,575 from 6,027.

  $$6,027 - 4,575$$ $$\begin{array}{r} 6027 \\ - 4575 \\ \hline 1452 \end{array}$$

  The difference is $\boxed{\text{1,452}}$.

• d) Subtract 2,538 from 7,550.

  $$7,550 - 2,538$$ $$\begin{array}{r} 7550 \\ - 2538 \\ \hline 5012 \end{array}$$

  The difference is $\boxed{\text{5,012}}$.

• e) Subtract 457 from 3,600.

  $$3,600 - 457$$ $$\begin{array}{r} 3600 \\ - \quad 457 \\ \hline 3143 \end{array}$$

  The difference is $\boxed{\text{3,143}}$.

• f) Subtract 2,753 from 4,521.

  $$4,521 - 2,753$$ $$\begin{array}{r} 4521 \\ - 2753 \\ \hline 1768 \end{array}$$

  The difference is $\boxed{\text{1,768}}$.