how do you write a 4 didget number in expandable form ?

I m not sure what you mean but perhaps expanded in powers of ten?

For example
5738 = 5000 + 700 + 30 + 8
or
5*1000 + 7*100 +4*10 + 8*1

149-13

7

4532=4000+500+30+2

To write a 4-digit number in expanded form, you need to break down the number into its place values. Each digit in a number represents its value in relation to its position or place.

Let's take an example number, such as 4,567.

1. Start from the leftmost digit and separate each digit by its place value:
- The digit 4 is in the thousands place.
- The digit 5 is in the hundreds place.
- The digit 6 is in the tens place.
- The digit 7 is in the ones place.

2. Now, write each digit in its place value form, separated by addition signs:
- 4,000 (4 x 1000) + 500 (5 x 100) + 60 (6 x 10) + 7 (7 x 1).

3. Simplify the calculations:
- 4,000 + 500 + 60 + 7.

4. Finally, add the numbers together:
- 4,000 + 500 + 60 + 7 = 4,567.

Therefore, the expanded form of the 4-digit number 4,567 is 4,000 + 500 + 60 + 7.