Comprehensive math worksheet designed to help students practice multiplying various numbers by 100 through different exercise formats.

Problem: Solving the Multiplying by 100 Worksheet

The worksheet is divided into three sections: A) Multiplications, B) Making numbers 100 times bigger, and C) Filling in missing numbers. Below is a detailed solution for each section.

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Section A: Work out these multiplications

#### Instructions:
Multiply each number by 100.

#### Solutions:
1. \( 7 \times 100 = 700 \)
2. \( 2 \times 100 = 200 \)
3. \( 100 \times 8 = 800 \)
4. \( 12 \times 100 = 1200 \)
5. \( 100 \times 15 = 1500 \)
6. \( 18 \times 100 = 1800 \)
7. \( 100 \times 16 = 1600 \)
8. \( 22 \times 100 = 2200 \)
9. \( 100 \times 21 = 2100 \)
10. \( 32 \times 100 = 3200 \)
11. \( 100 \times 30 = 3000 \)
12. \( 28 \times 100 = 2800 \)
13. \( 100 \times 43 = 4300 \)
14. \( 54 \times 100 = 5400 \)
15. \( 100 \times 37 = 3700 \)
16. \( 80 \times 100 = 8000 \)
17. \( 100 \times 47 = 4700 \)
18. \( 59 \times 100 = 5900 \)
19. \( 100 \times 78 = 7800 \)
20. \( 65 \times 100 = 6500 \)
21. \( 100 \times 84 = 8400 \)
22. \( 96 \times 100 = 9600 \)
23. \( 100 \times 59 = 5900 \)
24. \( 48 \times 100 = 4800 \)

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Section B: Make each of these numbers 100 times bigger

#### Instructions:
Multiply each given number by 100.

#### Solutions:
1. \( 14 \rightarrow 14 \times 100 = 1400 \)
2. \( 26 \rightarrow 26 \times 100 = 2600 \)
3. \( 31 \rightarrow 31 \times 100 = 3100 \)
4. \( 40 \rightarrow 40 \times 100 = 4000 \)
5. \( 19 \rightarrow 19 \times 100 = 1900 \)
6. \( 55 \rightarrow 55 \times 100 = 5500 \)
7. \( 73 \rightarrow 73 \times 100 = 7300 \)
8. \( 69 \rightarrow 69 \times 100 = 6900 \)
9. \( 94 \rightarrow 94 \times 100 = 9400 \)
10. \( 51 \rightarrow 51 \times 100 = 5100 \)
11. \( 86 \rightarrow 86 \times 100 = 8600 \)
12. \( 49 \rightarrow 49 \times 100 = 4900 \)

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Section C: Fill in the missing numbers

#### Instructions:
Solve for the missing numbers in each equation.

#### Solutions:
1. \( 13 \times \_\_ = 1300 \)
- To find the missing number, divide 1300 by 13: \( 1300 \div 13 = 100 \)
- Answer: \( 100 \)

2. \( \_\_ \times 100 = 1800 \)
- To find the missing number, divide 1800 by 100: \( 1800 \div 100 = 18 \)
- Answer: \( 18 \)

3. \( 100 \times \_\_ = 1500 \)
- To find the missing number, divide 1500 by 100: \( 1500 \div 100 = 15 \)
- Answer: \( 15 \)

4. \( \_\_ \times 19 = 1900 \)
- To find the missing number, divide 1900 by 19: \( 1900 \div 19 = 100 \)
- Answer: \( 100 \)

5. \( 25 \times 100 = \_\_ \)
- Multiply 25 by 100: \( 25 \times 100 = 2500 \)
- Answer: \( 2500 \)

6. \( \_\_ \times 42 = 4200 \)
- To find the missing number, divide 4200 by 42: \( 4200 \div 42 = 100 \)
- Answer: \( 100 \)

7. \( 100 \times \_\_ = 3600 \)
- To find the missing number, divide 3600 by 100: \( 3600 \div 100 = 36 \)
- Answer: \( 36 \)

8. \( \_\_ \times 100 = 5500 \)
- To find the missing number, divide 5500 by 100: \( 5500 \div 100 = 55 \)
- Answer: \( 55 \)

9. \( 100 \times \_\_ = 3000 \)
- To find the missing number, divide 3000 by 100: \( 3000 \div 100 = 30 \)
- Answer: \( 30 \)

10. \( \_\_ \times 28 = 2800 \)
- To find the missing number, divide 2800 by 28: \( 2800 \div 28 = 100 \)
- Answer: \( 100 \)

11. \( 100 \times \_\_ = 7400 \)
- To find the missing number, divide 7400 by 100: \( 7400 \div 100 = 74 \)
- Answer: \( 74 \)

12. \( \_\_ \times 100 = 3900 \)
- To find the missing number, divide 3900 by 100: \( 3900 \div 100 = 39 \)
- Answer: \( 39 \)

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Final Answers:

Section A:
1. 700
2. 200
3. 800
4. 1200
5. 1500
6. 1800
7. 1600
8. 2200
9. 2100
10. 3200
11. 3000
12. 2800
13. 4300
14. 5400
15. 3700
16. 8000
17. 4700
18. 5900
19. 7800
20. 6500
21. 8400
22. 9600
23. 5900
24. 4800

Section B:
1. 1400
2. 2600
3. 3100
4. 4000
5. 1900
6. 5500
7. 7300
8. 6900
9. 9400
10. 5100
11. 8600
12. 4900

Section C:
1. 100
2. 18
3. 15
4. 100
5. 2500
6. 100
7. 36
8. 55
9. 30
10. 100
11. 74
12. 39

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Boxed Final Answer:
\[
\boxed{
\text{See solutions above.}
}
\]