Applying the Rounding Rules

Oct 13, 2025 by talynt.org 2 views

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Introduction

In this problem, we are given a number with a unique digit in each column. The number rounds to 4,200,000 to the nearest hundred thousand. Our goal is to find the smallest possible number that satisfies these conditions.

Understanding the Problem

To approach this problem, we need to understand the concept of rounding numbers to the nearest hundred thousand. When a number is rounded to the nearest hundred thousand, it means that the digits in the ten-thousand, thousand, hundred, and ten places are dropped, and the digit in the hundred-thousand place is rounded to the nearest hundred thousand.

Breaking Down the Number

Let's break down the number 4,200,000 to understand its components. We can represent this number as:

4,200,000 = 4 × 10^6 + 2 × 10^5 + 0 × 10^4 + 0 × 10^3 + 0 × 10^2 + 0 × 10^1 + 0 × 10^0

Rounding Rules

When rounding a number to the nearest hundred thousand, we need to follow these rules:

If the digit in the ten-thousand place is 5 or greater, we round up the digit in the hundred-thousand place.
If the digit in the ten-thousand place is less than 5, we round down the digit in the hundred-thousand place.

Applying the Rounding Rules

In this case, the number 4,200,000 rounds to 4,200,000 to the nearest hundred thousand. This means that the digit in the ten-thousand place is less than 5, so we round down the digit in the hundred-thousand place.

Finding the Smallest Possible Number

To find the smallest possible number that satisfies these conditions, we need to find the smallest possible value for each digit in the number. Since each digit in the number is unique, we can start by assigning the smallest possible value to the digit in the hundred-thousand place.

Assigning the Smallest Possible Value

The smallest possible value for the digit in the hundred-thousand place is 1. However, we need to ensure that the number still rounds to 4,200,000 to the nearest hundred thousand.

Considering the Ten-Thousand Place

If we assign the digit 1 to the hundred-thousand place, the number becomes 1,200,000. However, this number does not round to 4,200,000 to the nearest hundred thousand.

Considering the Ten-Thousand Place (continued)

To find the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand, we need to consider the next smallest possible value for the digit in the ten-thousand place.

Assigning the Next Smallest Possible Value

The next smallest possible value for the digit in the ten-thousand place is 2. If we assign the digit 2 to the ten-thousand place, the number becomes 1,220,000.

Checking the Rounding Rule

When we round 1,220,000 to the nearest hundred thousand, we get 1,200,000. However, this number does not satisfy the rounding rule, as the digit in the ten-thousand place is 2, which is less than 5.

Considering the Next Smallest Possible Value (continued)

To find the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand, we need to consider the next smallest possible value for the digit in the ten-thousand place.

Assigning the Next Smallest Possible Value (continued)

The next smallest possible value for the digit in the ten-thousand place is 3. If we assign the digit 3 to the ten-thousand place, the number becomes 1,230,000.

Checking the Rounding Rule (continued)

When we round 1,230,000 to the nearest hundred thousand, we get 1,200,000. However, this number does not satisfy the rounding rule, as the digit in the ten-thousand place is 3, which is less than 5.

Considering the Next Smallest Possible Value (continued)

To find the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand, we need to consider the next smallest possible value for the digit in the ten-thousand place.

Assigning the Next Smallest Possible Value (continued)

The next smallest possible value for the digit in the ten-thousand place is 4. If we assign the digit 4 to the ten-thousand place, the number becomes 1,240,000.

Checking the Rounding Rule (continued)

When we round 1,240,000 to the nearest hundred thousand, we get 1,200,000. However, this number does not satisfy the rounding rule, as the digit in the ten-thousand place is 4, which is less than 5.

Considering the Next Smallest Possible Value (continued)

To find the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand, we need to consider the next smallest possible value for the digit in the ten-thousand place.

Assigning the Next Smallest Possible Value (continued)

The next smallest possible value for the digit in the ten-thousand place is 5. If we assign the digit 5 to the ten-thousand place, the number becomes 1,250,000.

Checking the Rounding Rule (continued)

When we round 1,250,000 to the nearest hundred thousand, we get 1,200,000. However, this number does not satisfy the rounding rule, as the digit in the ten-thousand place is 5, which is greater than 5.

Applying the Rounding Rule

Since the digit in the ten-thousand place is 5, we round up the digit in the hundred-thousand place. Therefore, the number 1,250,000 rounds to 1,200,000 is incorrect, and the correct rounding is 1,300,000.

Finding the Smallest Possible Number (continued)

To find the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand, we need to consider the next smallest possible value for the digit in the ten-thousand place.

Assigning the Next Smallest Possible Value (continued)

The next smallest possible value for the digit in the ten-thousand place is 6. However, we need to ensure that the number still rounds to 4,200,000 to the nearest hundred thousand.

Considering the Next Smallest Possible Value (continued)

To find the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand, we need to consider the next smallest possible value for the digit in the ten-thousand place.

Assigning the Next Smallest Possible Value (continued)

The next smallest possible value for the digit in the ten-thousand place is 7. If we assign the digit 7 to the ten-thousand place, the number becomes 1,270,000.

Checking the Rounding Rule (continued)

When we round 1,270,000 to the nearest hundred thousand, we get 1,300,000. However, this number does not satisfy the rounding rule, as the digit in the ten-thousand place is 7, which is greater than 5.

Applying the Rounding Rule (continued)

Since the digit in the ten-thousand place is 7, we round up the digit in the hundred-thousand place. Therefore, the number 1,270,000 rounds to 1,300,000.

Finding the Smallest Possible Number (continued)

To find the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand, we need to consider the next smallest possible value for the digit in the ten-thousand place.

Assigning the Next Smallest Possible Value (continued)

The next smallest possible value for the digit in the ten-thousand place is 8. If we assign the digit 8 to the ten-thousand place, the number becomes 1,280,000.

Checking the Rounding Rule (continued)

When we round 1,280,000 to the nearest hundred thousand, we get 1,300,000. However, this number does not satisfy the rounding rule, as the digit in the ten-thousand place is 8, which is greater than 5.

Applying the Rounding Rule (continued)

Since the digit in the ten-thousand place is 8, we round up the digit in the hundred-thousand place. Therefore, the number 1,280,000 rounds to 1,300,000.

Finding the Smallest Possible Number (continued)

To find the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand, we need to consider the next smallest possible value for the digit in the ten-thousand place.

Assigning the Next Smallest Possible Value (continued)

The next smallest possible value for the digit in the ten-thousand place is 9. If we assign the digit 9 to the ten-thousand place, the number becomes 1,290,000.

Checking the Rounding Rule (continued)

When we round 1,290,000 to the nearest hundred thousand, we get 1,300,000. However, this number does not satisfy the rounding rule, as the digit in the ten-thousand place is

Introduction

In our previous article, we explored the problem of finding the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand. We broke down the number, applied the rounding rules, and found the smallest possible number that satisfies these conditions. In this article, we will answer some frequently asked questions related to this problem.

Q: What is the smallest possible number that rounds to 4,200,000 to the nearest hundred thousand?

A: The smallest possible number that rounds to 4,200,000 to the nearest hundred thousand is 4,190,000.

Q: Why is 4,190,000 the smallest possible number?

A: 4,190,000 is the smallest possible number because it has the smallest possible value for each digit in the number. The digit in the hundred-thousand place is 4, the digit in the ten-thousand place is 1, the digit in the thousand place is 9, the digit in the hundred place is 0, the digit in the ten place is 0, and the digit in the unit place is 0.

Q: How did you find the smallest possible number?

A: We found the smallest possible number by applying the rounding rules and considering the next smallest possible value for each digit in the number. We started with the digit in the hundred-thousand place and worked our way down to the unit place.

Q: What is the significance of the rounding rules in this problem?

A: The rounding rules are crucial in this problem because they determine how the number is rounded to the nearest hundred thousand. If the digit in the ten-thousand place is 5 or greater, we round up the digit in the hundred-thousand place. If the digit in the ten-thousand place is less than 5, we round down the digit in the hundred-thousand place.

Q: Can you explain the concept of rounding numbers to the nearest hundred thousand?

A: Rounding numbers to the nearest hundred thousand involves dropping the digits in the ten-thousand, thousand, hundred, and ten places and rounding the digit in the hundred-thousand place to the nearest hundred thousand.

Q: How do you determine the smallest possible number that rounds to a given number?

A: To determine the smallest possible number that rounds to a given number, we need to apply the rounding rules and consider the next smallest possible value for each digit in the number. We start with the digit in the highest place value and work our way down to the lowest place value.

Q: What is the relationship between the smallest possible number and the given number?

A: The smallest possible number is the smallest number that rounds to the given number. In this case, the smallest possible number is 4,190,000, and the given number is 4,200,000.

Q: Can you provide an example of a number that rounds to 4,200,000 to the nearest hundred thousand?

A: An example of a number that rounds to 4,200,000 to the nearest hundred thousand is 4,190,000.

Q: How do you know that 4,190,000 is the smallest possible number?

A: We know that 4,190,000 is the smallest possible number because it has the smallest possible value for each digit in the number. We applied the rounding rules and considered the next smallest possible value for each digit in the number to find the smallest possible number.

Q: What is the significance of the digit in the ten-thousand place in this problem?

A: The digit in the ten-thousand place is significant in this problem because it determines whether we round up or down the digit in the hundred-thousand place. If the digit in the ten-thousand place is 5 or greater, we round up the digit in the hundred-thousand place. If the digit in the ten-thousand place is less than 5, we round down the digit in the hundred-thousand place.

Q: Can you explain the concept of place value in this problem?

A: Place value refers to the value of each digit in a number based on its position. In this problem, we have the hundred-thousand place, the ten-thousand place, the thousand place, the hundred place, the ten place, and the unit place. Each digit in the number has a specific place value based on its position.

Q: How do you determine the place value of each digit in a number?

A: To determine the place value of each digit in a number, we need to consider the position of each digit. The digit in the highest place value has the greatest place value, and the digit in the lowest place value has the least place value.

Q: What is the relationship between the place value and the rounding rules?

A: The place value and the rounding rules are related in this problem because the place value determines the value of each digit in the number. The rounding rules are applied based on the value of each digit in the number.

Q: Can you provide an example of a number that has a different digit in each column?

A: An example of a number that has a different digit in each column is 4,190,000.

Q: How do you know that 4,190,000 has a different digit in each column?

A: We know that 4,190,000 has a different digit in each column because each digit in the number is unique. The digit in the hundred-thousand place is 4, the digit in the ten-thousand place is 1, the digit in the thousand place is 9, the digit in the hundred place is 0, the digit in the ten place is 0, and the digit in the unit place is 0.

Q: What is the significance of having a different digit in each column in this problem?

A: Having a different digit in each column is significant in this problem because it ensures that the number has a unique value. Each digit in the number contributes to the overall value of the number.

Q: Can you explain the concept of uniqueness in this problem?

A: Uniqueness refers to the fact that each digit in the number is unique. In this problem, we have a number that has a different digit in each column, which ensures that the number has a unique value.

Q: How do you determine the uniqueness of each digit in a number?

A: To determine the uniqueness of each digit in a number, we need to consider the value of each digit. Each digit in the number must have a unique value to ensure that the number has a unique value.

Q: What is the relationship between uniqueness and the rounding rules?

A: Uniqueness and the rounding rules are related in this problem because the uniqueness of each digit in the number determines the value of the number. The rounding rules are applied based on the value of the number.

Q: Can you provide an example of a number that rounds to 4,200,000 to the nearest hundred thousand and has a different digit in each column?

A: An example of a number that rounds to 4,200,000 to the nearest hundred thousand and has a different digit in each column is 4,190,000.

Q: How do you know that 4,190,000 is an example of a number that rounds to 4,200,000 to the nearest hundred thousand and has a different digit in each column?

A: We know that 4,190,000 is an example of a number that rounds to 4,200,000 to the nearest hundred thousand and has a different digit in each column because it meets both conditions. The number rounds to 4,200,000 to the nearest hundred thousand, and each digit in the number is unique.