The image contains a series of multiple-choice math questions written in Chinese. I can help translate, interpret, and solve these questions step-by-step. Let's start with a detailed analysis of the questions and their solutions.

Question-by-Question Analysis:

1. Question 1: Financial estimation problem about the amount between 600,000 and 800,000.

   • Options: (A) 60万和80万之间, (B) 80万和60万之间, (C) 60万和80之间, (D) 80和60之间.

2. Question 2: Fraction and proportion problem comparing some values.

   • Options: (A) 一又四分之二, (B) 一又四分之七, (C) 四分之三, (D) 一又八分之七.

3. Question 3: A comparison of different values involving multiplication and subtraction.

   • Options involve operations like $3.789$, $4.673$, $0.567$, and more.

4. Question 4: A cost estimation problem for a wristwatch.

   • Options: (A) RM200.36, (B) RM236, (C) RM272, (D) RM296.

5. Question 5: Mortgage payment estimation involving monthly payments.

   • Options: (A) RM7 200, (B) RM31 400, (C) RM72 000, (D) RM5 500.

6. Question 6: Time duration problem regarding a construction project.

   • Options: (A) 12, (B) 15, (C) 17, (D) 18.

7. Question 7: Distance calculation between two towns X and Y.

   • Options: (A) 70.6, (B) 48.6, (C) 35.3, (D) 10.4.

8. Question 8: A problem involving Chen Tai's use of flour in packs.

   • Options: (A) 620, (B) 800, (C) 1600, (D) 6600.

9. Question 9: Problem involving daily water usage estimation.

   • Options: (A) 1670, (B) 1865, (C) 2000, (D) 2175.

10. Question 10: Weight comparison problem involving several values.

    • Options: (A) 31.84, (B) 31.6, (C) 33.4, (D) 34.4.

11. Question 11: Problem involving half a year's daily usage and spring festival consumption.

    • Options: (A) $1 \frac{1}{4}$, (B) 3, (C) 7, (D) 6.

12. Question 12: Problem involving estimation of time for filling a fish pond.

    • Options: (A) 620, (B) 830, (C) 700, (D) 580.

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5. Do you need additional practice questions related to any of these topics?

Tip: Carefully analyzing each question type helps you identify the mathematical operation needed, such as addition, subtraction, or multiplication, making problem-solving more straightforward.