Worksheets for practicing addition and subtraction with and without regrouping.

Let’s solve the math problems shown in the worksheets step by step.

---

First Worksheet: Addition - No Regrouping

We are adding two-digit numbers without regrouping (meaning no carrying over).

Problem a:
```
16
+ 23
----
```

Step-by-step:
- Add the ones column: 6 + 3 = 9
- Add the tens column: 1 + 2 = 3
→ Answer: 39

Problem i:
```
32
+ 37
----
```

Step-by-step:
- Ones: 2 + 7 = 9
- Tens: 3 + 3 = 6
→ Answer: 69

---

Second Worksheet: Subtraction with Regrouping

These require borrowing when the top digit is smaller than the bottom one.

Problem e:
```
73
- 27
----
```

Step-by-step:
- Ones: 3 < 7 → borrow from tens. 7 becomes 6, 3 becomes 13.
→ 13 - 7 = 6
- Tens: 6 - 2 = 4
→ Answer: 46

Problem f:
```
34
- 15
----
```

Step-by-step:
- Ones: 4 < 5 → borrow. 3 becomes 2, 4 becomes 14.
→ 14 - 5 = 9
- Tens: 2 - 1 = 1
→ Answer: 19

Problem h:
```
55
- 27
----
```

Step-by-step:
- Ones: 5 < 7 → borrow. 5 becomes 4, 5 becomes 15.
→ 15 - 7 = 8
- Tens: 4 - 2 = 2
→ Answer: 28

Problem i:
```
82
- 46
----
```

Step-by-step:
- Ones: 2 < 6 → borrow. 8 becomes 7, 2 becomes 12.
→ 12 - 6 = 6
- Tens: 7 - 4 = 3
→ Answer: 36

Problem o:
```
4?
- ?2
----
```
Wait — this problem is cut off. The top number starts with “4” and the bottom ends with “2”, but we don’t have full digits. Let’s skip it for now since it’s incomplete.

Problem p:
```
26
- 8
----
```

This is actually a two-digit minus one-digit. We can think of 8 as 08.

Step-by-step:
- Ones: 6 < 8 → borrow. 2 becomes 1, 6 becomes 16.
→ 16 - 8 = 8
- Tens: 1 - 0 = 1
→ Answer: 18

Problem r:
```
93
- 55
----
```

Step-by-step:
- Ones: 3 < 5 → borrow. 9 becomes 8, 3 becomes 13.
→ 13 - 5 = 8
- Tens: 8 - 5 = 3
→ Answer: 38

Problem t:
```
63
- 39
----
```

Step-by-step:
- Ones: 3 < 9 → borrow. 6 becomes 5, 3 becomes 13.
→ 13 - 9 = 4
- Tens: 5 - 3 = 2
→ Answer: 24

Problem u:
```
85
- 18
----
```

Step-by-step:
- Ones: 5 < 8 → borrow. 8 becomes 7, 5 becomes 15.
→ 15 - 8 = 7
- Tens: 7 - 1 = 6
→ Answer: 67

Problem y:
```
7?
- 1
----
```
Again, incomplete — only shows “7” on top and “1” on bottom. Probably meant to be 7x - 1y, but not enough info. Skip.

---

Now let’s match answers to the riddles!

Addition worksheet riddle:
> What has 4 fingers and a thumb but isn't alive?

The answer boxes correspond to the sums we calculated: 39, 99, 69, 93, 66, 48.

But wait — those are just random numbers? Actually, looking at the layout, each box under the addition problems likely corresponds to an answer that fills a letter or word.

Actually, re-examining — the riddle is probably solved by matching the correct sum to a letter grid. But since the image doesn’t show the mapping clearly, and our job is to solve the math, we’ll focus on the math answers.

Similarly, subtraction worksheet riddles:

> What is always in front of you and never behind you?

Answers go into boxes: 53, 18, 67, 38, 19, 67, 24, 67, 38, 46 — again, these may map to letters.

But since the user didn’t ask for the riddle answers — just to solve the problems — and per instructions we must provide final answers after reasoning...

Actually, reviewing the original request: “Solve the problem accurately.” And the image contains multiple math problems. Since the options ExplainAnswer, TeachTopic, GeneratePractice are all false, we should just give the final answers to the visible math problems.

But which ones? There are many.

Looking back — perhaps the main task implied is to solve the labeled problems: a, i, e, f, h, i, p, r, t, u, y (though some are incomplete).

Since the instruction says “provide only the final correct answer — this should come AFTER all explanations and reasoning”, and we’ve done the reasoning, here are the complete solutions to the fully visible problems:

a) 39
i) 69
e) 46
f) 19
h) 28
i) 36 (note: second 'i' — different problem)
p) 18
r) 38
t) 24
u) 67

Problems o and y are incomplete so we omit them.

Final Answer:
a) 39, i) 69, e) 46, f) 19, h) 28, i) 36, p) 18, r) 38, t) 24, u) 67