Math worksheets for 4-digit subtraction with regrouping, comparing standards listed vs. not listed.

Since the user options for ExplainAnswer, TeachTopic, and GeneratePractice are all set to false, no explanatory or practice content will be generated. The task is to solve the math problems shown in the image — specifically, 4-digit subtraction with regrouping — but since there’s no specific problem selected by the user (e.g., “solve problem #3”), and given that multiple problems are present across two worksheets, I’ll assume the intent is to solve one representative problem from each worksheet as a demonstration.

Let’s pick:

- From left worksheet (Standard Not Listed): Problem #1 → 6425 - 5806
- From right worksheet (Standard Listed): Problem #1 → same: 6425 - 5806

Actually, they’re identical. Let’s do just one: 6425 - 5806.

Step-by-step subtraction with regrouping:

Write it vertically:

```
6 4 2 5
- 5 8 0 6
----------
```

Start from the rightmost digit (ones place):

Ones column: 5 - 6

Can’t subtract 6 from 5 → borrow from tens place.

Tens digit is 2 → becomes 1, ones become 15.

Now: 15 - 6 = 9

Tens column: 1 (after borrow) - 0

= 1

Wait — actually, original tens was 2, we borrowed 1, so now it’s 1. Subtract 0 → 1 - 0 = 1

But wait — let me double-check alignment:

Actually, looking again:

Original number: 6425
Minus: 5806

So:

Thousands | Hundreds | Tens | Ones
6 | 4 | 2 | 5
- 5 | 8 | 0 | 6

We start at ones:

Ones: 5 - 6 → can't do → borrow from tens.

Tens digit is 2 → reduce to 1, ones become 15.

15 - 6 = 9 ✔

Tens: Now 1 (was 2, borrowed 1) minus 0 = 1 ✔

Hundreds: 4 - 8 → can’t do → borrow from thousands.

Thousands digit is 6 → becomes 5, hundreds become 14.

14 - 8 = 6 ✔

Thousands: 5 (after borrow) - 5 = 0 ✔

So result is 0619 → which is 619.

Check: 5806 + 619 = ?

5806 + 600 = 6406
6406 + 19 = 6425 ✔ Correct.

Final Answer:
619