Round off each of the following numbers to the nearest ten. Nearest hundred and nearest thousand.
a. 7 b. 26 c. 390 d. 432 e. 7832 f. 56873

Answer

To round off the given numbers to the nearest ten, hundred, and thousand, we will follow a systematic approach for each number.

### Step-by-Step Solution:

**Step 1: Round to the Nearest Ten**
- **a. 7**: The unit digit is 7. Since 7 is greater than 5, we round up to 10.
- **b. 26**: The unit digit is 6. Since 6 is greater than 5, we round up to 30.
- **c. 390**: The unit digit is 0. Since 0 is less than 5, we keep it as 390.
- **d. 432**: The unit digit is 2. Since 2 is less than 5, we round down to 430.
- **e. 7832**: The unit digit is 2. Since 2 is less than 5, we round down to 7830.
- **f. 56873**: The unit digit is 3. Since 3 is less than 5, we round down to 56870.

**Step 2: Round to the Nearest Hundred**
- **a. 7**: There is no tens digit, so we consider it as 0. Since 0 is less than 50, we round down to 0.
- **b. 26**: The tens digit is 2. Since 26 is less than 50, we round down to 0.
- **c. 390**: The tens digit is 9. Since 90 is greater than 50, we round up to 400.
- **d. 432**: The tens digit is 3. Since 32 is less than 50, we round down to 400.
- **e. 7832**: The tens digit is 3. Since 32 is less than 50, we round down to 7800.
- **f. 56873**: The tens digit is 7. Since 73 is greater than 50, we round up to 56900.

**Step 3: Round to the Nearest Thousand**
- **a. 7**: There is no hundreds digit, so we consider it as 0. Since 0 is less than 500, we round down to 0.
- **b. 26**: There is no hundreds digit, so we consider it as 0. Since 0 is less than 500, we round down to 0.
- **c. 390**: There is no hundreds digit, so we consider it as 0. Since 0 is less than 500, we round down to 0.
- **d. 432**: There is no hundreds digit, so we consider it as 0. Since 0 is less than 500, we round down to 0.
- **e. 7832**: The hundreds digit is 8. Since 832 is greater than 500, we round up to 8000.
- **f. 56873**: The hundreds digit is 8. Since 873 is greater than 500, we round up to 57000.

### Final Answers:
- **Nearest Ten**:
- a. 10
- b. 30
- c. 390
- d. 430
- e. 7830
- f. 56870

- **Nearest Hundred**:
- a. 0
- b. 0
- c. 400
- d. 400
- e. 7800
- f. 56900

- **Nearest Thousand**:
- a. 0
- b. 0
- c. 0
- d. 0
- e. 8000
- f. 57000