I see you’ve uploaded a worksheet. I’ll extract and solve the mathematical problems from it. Give me a moment to review the questions.

Solutions to the Problems:

1. 57,834 + 9,057
   $57,834 + 9,057 = 66,891$

2. 386 × 49
   $386 \times 49 = 18,914$

3. 7026 − 2947
   $7026 - 2947 = 4,079$

4. 7496 ÷ 8
   $7496 \div 8 = 937$

5. $\frac{1}{3}h − \frac{1}{4}h = \frac{1}{12}h$
   $\frac{1}{3} − \frac{1}{4} = \frac{4}{12} − \frac{3}{12} = \frac{1}{12}$

6. 4% of 60,000
   $4\% \times 60,000 = 0.04 \times 60,000 = 2,400$

7. $10^3 − 6^2$
   $10^3 = 1,000$, $6^2 = 36$. So, $1,000 − 36 = 964$.

8. $7^{20} = 7^{20 − 7} = 7^{13}$
   Simplifies to: $7^{13}$.

9. 20 + 0.4
   $20 + 0.4 = 20.4$

10. $\frac{1}{10} × \frac{3}{8}$
    $\frac{1}{10} × \frac{3}{8} = \frac{3}{80}$

11. Speed of 16 km/h for 10 min
    $16 \text{ km/h} = \frac{16}{60} \text{ km/min}.$
    In 10 min: $\frac{16}{60} × 10 = \frac{160}{60} = 2.67 \, \text{km}.$

12. Cost of $3.5 \, \text{kg at 14p per } \frac{1}{2} \, \text{kg}$
    $3.5 \div 0.5 = 7 \text{ (halves)}.$
    Total cost: $7 × 14 = 98 \, \text{p} = £0.98.$

If you would like me to continue solving or clarify a particular problem, let me know!

1. Would you like further details for any calculations?
2. Do you need specific formatting for the answers?
3. Should I proceed with solving the rest?
4. Would you like me to present solutions in steps for better understanding?
5. Do you want visual aids for explanations of geometric problems?

Tip: Always double-check arithmetic in non-calculator exams by reverse calculating.