Students can use the provided place value chart to solve multiplication and division problems involving large numbers.

Problem Analysis:

The task involves using the concept of place value to solve problems related to multiplication and division of numbers in different place values (e.g., ones, tens, hundreds, thousands, etc.). We will solve each problem step by step.

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Place Value Recap:

- Ones: The rightmost digit.
- Tens: The second digit from the right.
- Hundreds: The third digit from the right.
- Thousands: The fourth digit from the right.
- Ten Thousands: The fifth digit from the right.
- Hundred Thousands: The sixth digit from the right.
- Millions: The seventh digit from the right.

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Solutions:

#### 1. 10 times 30 thousands is _________.
- Step 1: Identify the place value of "30 thousands."
- 30 thousands = 30,000.
- Step 2: Multiply by 10.
- \( 30,000 \times 10 = 300,000 \).
- Answer: 300,000.

#### 2. 100 times 7 ones is _________.
- Step 1: Identify the place value of "7 ones."
- 7 ones = 7.
- Step 2: Multiply by 100.
- \( 7 \times 100 = 700 \).
- Answer: 700.

#### 3. 1000 times 4 hundreds is _________.
- Step 1: Identify the place value of "4 hundreds."
- 4 hundreds = 400.
- Step 2: Multiply by 1000.
- \( 400 \times 1000 = 400,000 \).
- Answer: 400,000.

#### 4. _______ times 9 thousands is 9 millions.
- Step 1: Identify the place value of "9 thousands."
- 9 thousands = 9,000.
- Step 2: Identify the place value of "9 millions."
- 9 millions = 9,000,000.
- Step 3: Set up the equation.
- \( x \times 9,000 = 9,000,000 \).
- Step 4: Solve for \( x \).
- \( x = \frac{9,000,000}{9,000} = 1,000 \).
- Answer: 1,000.

#### 5. _______ times 20 thousands is 200 thousands.
- Step 1: Identify the place value of "20 thousands."
- 20 thousands = 20,000.
- Step 2: Identify the place value of "200 thousands."
- 200 thousands = 200,000.
- Step 3: Set up the equation.
- \( x \times 20,000 = 200,000 \).
- Step 4: Solve for \( x \).
- \( x = \frac{200,000}{20,000} = 10 \).
- Answer: 10.

#### 6. 90 thousands divided by 100 is _________.
- Step 1: Identify the place value of "90 thousands."
- 90 thousands = 90,000.
- Step 2: Divide by 100.
- \( \frac{90,000}{100} = 900 \).
- Answer: 900.

#### 7. 5 millions divided by 10 is _________.
- Step 1: Identify the place value of "5 millions."
- 5 millions = 5,000,000.
- Step 2: Divide by 10.
- \( \frac{5,000,000}{10} = 500,000 \).
- Answer: 500,000.

#### 8. 800 thousands divided by _______ is 8 hundreds.
- Step 1: Identify the place value of "800 thousands."
- 800 thousands = 800,000.
- Step 2: Identify the place value of "8 hundreds."
- 8 hundreds = 800.
- Step 3: Set up the equation.
- \( \frac{800,000}{x} = 800 \).
- Step 4: Solve for \( x \).
- \( x = \frac{800,000}{800} = 1,000 \).
- Answer: 1,000.

#### 9. 3 hundreds divided by 10 is _________.
- Step 1: Identify the place value of "3 hundreds."
- 3 hundreds = 300.
- Step 2: Divide by 10.
- \( \frac{300}{10} = 30 \).
- Answer: 30.

#### 10. 7 thousands divided by 1,000 is _________.
- Step 1: Identify the place value of "7 thousands."
- 7 thousands = 7,000.
- Step 2: Divide by 1,000.
- \( \frac{7,000}{1,000} = 7 \).
- Answer: 7.

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Final Answers:

1. 300,000
2. 700
3. 400,000
4. 1,000
5. 10
6. 900
7. 500,000
8. 1,000
9. 30
10. 7

Boxed Answer:
\[
\boxed{300000, 700, 400000, 1000, 10, 900, 500000, 1000, 30, 7}
\]