Let's go through the questions in the image and solve them one by one. I will write the solutions and answers below each problem:

Left Column:

1. 5 - 4 =
   $5 - 4 = 1$ Answer: 1

2. 100 ÷ 4 =
   $100 ÷ 4 = 25$ Answer: 25

3. Halve 6:
   Half of 6 is $\frac{6}{2} = 3$ Answer: 3

4. 15 - 10 =
   $15 - 10 = 5$ Answer: 5

5. 4749 - 4746 =
   $4749 - 4746 = 3$ Answer: 3

6. 5 × 2 =
   $5 \times 2 = 10$ Answer: 10

7. What is 15:10 in 12-hour clock format?
   15:10 in 12-hour clock format is 3:10 PM. Answer: 3:10 PM

8. What time will it be 28 minutes after 7:46 am?
   Adding 28 minutes to 7:46 am:
   $7:46 + 28 = 8:14$ am. Answer: 8:14 am

Middle Column:

1. 80 ÷ 8 =
   $80 ÷ 8 = 10$ Answer: 10

2. 5^2 =
   $5^2 = 25$ Answer: 25

3. 34 - 8 =
   $34 - 8 = 26$ Answer: 26

4. 7 × 6 =
   $7 \times 6 = 42$ Answer: 42

5. 2 × 9 =
   $2 \times 9 = 18$ Answer: 18

6. 8^2 - 63 =
   $8^2 - 63 = 64 - 63 = 1$ Answer: 1

7. 70 ÷ 10 =
   $70 ÷ 10 = 7$ Answer: 7

8. 2 + 7 =
   $2 + 7 = 9$ Answer: 9

Right Column:

1. 70B = 53
   The question seems incomplete or incorrect, so it cannot be solved as given.

2. 1722 ÷ 88 =
   $1722 ÷ 88 = 19.57$ (approximately) Answer: 19.57

3. 5.6 × 5 =
   $5.6 \times 5 = 28$ Answer: 28

4. 30% as a fraction
   $\frac{30}{100} = \frac{3}{10}$ Answer: $\frac{3}{10}$

5. 3.85 as a fraction
   $3.85 = \frac{385}{100} = \frac{77}{20}$ (simplified) Answer: $\frac{77}{20}$

6. Round 2444 to 3 s.f.
   2444 rounded to 3 significant figures is 2440. Answer: 2440

7. What is the letter at (0, 0)?
   (The question likely refers to a grid not shown in the provided image, so I cannot provide an answer without more information.)

8. What is 3/5 of 25?
   $\frac{3}{5} \times 25 = 15$ Answer: 15

Would you like more detailed explanations for any of the answers, or do you have any further questions?

Here are 5 relative questions you might be interested in:

1. How do you convert a percentage to a fraction?
2. How do you find a fraction of a number?
3. What are significant figures in rounding, and how do you use them?
4. How do you interpret time in a 12-hour and 24-hour format?
5. How do you multiply decimals by whole numbers?

Tip: When rounding numbers to significant figures, remember to start counting from the first non-zero digit, and be careful with rounding the final digit based on what follows it.