Count forward by 1s, 10s, 100s, and 1,000s

Detailed Explanation: Count forward by 1s, 10s, 100s, and 1,000s

To count forward, add the same place-value unit each time:

• By $1$: the ones digit changes.
• By $10$: the tens digit changes.
• By $100$: the hundreds digit changes.
• By $1{,}000$: the thousands digit changes.

If a digit reaches $10$, regroup it into the next place.

Example: Start with $2{,}398$. Find the next two numbers when counting by each unit.

Counting by $1$:

Add $1$ each time.

The next step makes the ones digit regroup:

So the numbers are $2{,}399,\ 2{,}400$.

Counting by $10$:

Add $10$ each time. The tens digit changes, while the ones digit stays $8$.

So the numbers are $2{,}408,\ 2{,}418$.

Counting by $100$:

Add $100$ each time. The hundreds digit changes, while the tens and ones digits stay $98$.

So the numbers are $2{,}498,\ 2{,}598$.

Counting by $1{,}000$:

Add $1{,}000$ each time. The thousands digit changes, while the hundreds, tens, and ones digits stay $398$.

So the numbers are $3{,}398,\ 4{,}398$.

Always add the same amount, and watch for regrouping when a place-value digit reaches $10$.