What is the difference between the numbers? What number comes next? Complete the table: Subtract from the given number.

$$7 + 2 = 9$$

Next number: 9

$$\boxed{9}$$

1b.
$10, 20, \square$

$$20 + 10 = 30$$

Next number: 30

$$\boxed{30}$$

1c.
$135, 235, \square$

$$235 + 100 = 335$$

Next number: 335

$$\boxed{335}$$

1d.
$284, 304, \square$

$$304 + 20 = 324$$

Next number: 324

$$\boxed{324}$$

1e.
$414, 516, \square$

$$516 - 414$$ $$516 - 400 = 116$$ $$116 - 14 = 102$$

$$516 + 102$$ $$516 + 100 = 616$$ $$616 + 2 = 618$$

Next number: 618

$$\boxed{618}$$

1f.
$474, 674, \square$

$$674 + 200 = 874$$

Next number: 874

$$\boxed{874}$$

2. Complete the table.

$$\begin{array}{c|c|c} \textbf{Number} & \textbf{Subtract 1} & \textbf{Subtract 10} \\ \hline 164 & & \\ 327 & & \end{array}$$

For $164 - 1$:

$$164 - 1 = 163$$

For $164 - 10$:

$$164 - 10 = 154$$

For $327 - 1$:

$$327 - 1 = 326$$

For $327 - 10$:

$$327 - 10 = 317$$

Completed table:

$$\begin{array}{c|c|c} \textbf{Number} & \textbf{Subtract 1} & \textbf{Subtract 10} \\ \hline 164 & 163 & 154 \\ 327 & 326 & 317 \end{array}$$ $$\boxed{\begin{array}{c|c|c} 164 & 163 & 154 \\ 327 & 326 & 317 \end{array}}$$