Understand Decimal Place Value Relationships

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5th Grade Math › Understand Decimal Place Value Relationships

Questions 1 - 10
1

A science beaker has $4.08$ liters of water. In $4.08$, the digit 0 is in the tenths place and the digit 8 is in the hundredths place (adjacent places). Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. Which statement about the digit 8 is correct?

The digit 8 has a value of 0.8 because the hundredths place is to the right of the tenths place.

The digit 8 has a value of 8 because digits keep the same value in any place.

The digit 8 has a value of 0.008 because the hundredths place is 10 times the thousandths place.

The digit 8 has a value of 0.08 because it is in the hundredths place.

Explanation

The value of a digit in a number depends on its position or place in the number. Each place value is 10 times greater than the place immediately to its right. Similarly, each place value is 1/10 of the place immediately to its left. For example, in the number 4.08, the digit 8 in the hundredths place has a value of 0.08, which is 1/10 of what it would be in the tenths place. A common misconception is that the value stays the same in any decimal place, but each place scales the digit by powers of 1/10. Knowing place value helps compare adjacent places and understand relative sizes. It also aids in performing calculations with decimals accurately.

2

A store sign shows a price of $15.50$. In $15.50$, the digit 5 is in the tenths place and the digit 0 is in the hundredths place (adjacent places). Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. If the digit 5 moved one place to the right, how would its value change?

Its value would stay the same because the digit is still 5.

Its value would become $\tfrac{1}{10}$ as great.

Its value would become 10 times as great.

Its value would increase by 10.

Explanation

The value of a digit in a number depends on its position or place in the number. Each place value is 10 times greater than the place immediately to its right. Similarly, each place value is $\frac{1}{10}$ of the place immediately to its left. For example, in the number 15.50, moving the digit 5 from the tenths place ($0.5$) to the hundredths place changes its value to $0.05$, which is $\frac{1}{10}$ as great. A common misconception is that moving a digit doesn't change its value, but each shift right divides by 10. Place value allows us to understand how positions affect a number's overall value. This helps in comparing and ordering decimals effectively.

3

A classroom thermometer shows $23.45^\circ\text{C}$. In the number $23.45$, the digit 4 is in the tenths place and the digit 5 is in the hundredths place (these are adjacent places). Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. Which statement about the value of the digit 4 is correct?

The digit 4 has a value of 0.04 because the hundredths place is 10 times the tenths place.

The digit 4 has a value of 0.4 because the tenths place is 10 times the hundredths place.

The digit 4 has a value of 40 because the tenths place is 10 more than the ones place.

The digit 4 has a value of 4 because a digit’s value does not depend on its position.

Explanation

The value of a digit in a number depends on its position or place in the number. Each place value is 10 times greater than the place immediately to its right. Similarly, each place value is 1/10 of the place immediately to its left. For example, in the number 23.45, the digit 4 in the tenths place has a value of 0.4, which is 10 times the value of the digit 5 in the hundredths place at 0.05. A common misconception is that digits have fixed values regardless of position, but position multiplies the digit by the place's value, like tenths being 0.1. Understanding place value relationships allows us to compare digits across positions accurately. This knowledge helps in reading, writing, and operating on decimal numbers effectively.

4

A class collected $3,405$ cans for a food drive. In $3,405$, the digit 4 is in the hundreds place and the digit 0 is in the tens place (adjacent places). Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. Which statement about the digit 4 is correct?

The digit 4 has a value of 4,000 because the hundreds place is 10 times the thousands place.

The digit 4 has a value of 4 because digits always mean the same amount.

The digit 4 has a value of 400 because it is in the hundreds place.

The digit 4 has a value of 40 because it is next to the tens place.

Explanation

The value of a digit in a number depends on its position or place in the number. Each place value is 10 times greater than the place immediately to its right. Similarly, each place value is 1/10 of the place immediately to its left. For example, in the number 3,405, the digit 4 in the hundreds place has a value of 400, which is 10 times the tens place value. A common misconception is that digits always represent their face value, but place multiplies them by powers of 10. Understanding place value helps compare whole number positions and their contributions. It enables us to read and interpret large numbers correctly.

5

A water bottle holds $0.606$ liters. In $0.606$, the first 6 is in the tenths place and the second 6 is in the thousandths place. Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. Which statement correctly compares the value of the two digits 6?

The 6 in the thousandths place is 10 times the value of the 6 in the tenths place.

The 6 in the tenths place is 10 more than the 6 in the thousandths place.

Both digits 6 have the same value because they are the same digit.

The 6 in the tenths place is 100 times the value of the 6 in the thousandths place.

Explanation

The value of a digit in a number depends on its position or place in the number. Each place value is 10 times greater than the place immediately to its right. Similarly, each place value is 1/10 of the place immediately to its left. For example, in the number 0.606, the 6 in the tenths place is worth 0.6, which is 100 times the 6 in the thousandths place at 0.006 since there are two places between them. A common misconception is that same digits have equal values regardless of position, but position determines the actual worth. Place value relationships allow us to compare digits across multiple positions by multiplying or dividing by 10 for each shift. This understanding is crucial for grasping the magnitude of numbers in decimal form.

6

A hiker walked $18.072$ kilometers. In $18.072$, the digit 7 is in the hundredths place and the digit 2 is in the thousandths place (adjacent places). Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. Which statement about the relationship between the hundredths and thousandths places is correct?

The thousandths place is 10 times the hundredths place.

The hundredths place is 10 more than the thousandths place.

The hundredths place is 10 times the thousandths place.

The hundredths and thousandths places have the same value because they are both decimals.

Explanation

The value of a digit in a number depends on its position or place in the number. Each place value is 10 times greater than the place immediately to its right. Similarly, each place value is 1/10 of the place immediately to its left. For example, in the number 18.072, the hundredths place (0.01) is 10 times the thousandths place (0.001). A common misconception is that all decimal places have equal value, but they decrease by factors of 10. Place value relationships help in understanding precision in measurements. They also aid in comparing small decimal values accurately.

7

A library has $70,070$ books. In $70,070$, the digit 7 in the ten-thousands place and the digit 7 in the tens place are the same digit but in different positions. Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. Which statement correctly compares the value of the two digits 7?

Both digits 7 have the same value because they are both 7.

The 7 in the tens place is 1,000 times the value of the 7 in the ten-thousands place.

The 7 in the ten-thousands place is 10 more than the 7 in the tens place.

The 7 in the ten-thousands place is 1,000 times the value of the 7 in the tens place.

Explanation

The value of a digit in a number depends on its position or place in the number. Each place value is 10 times greater than the place immediately to its right. Similarly, each place value is 1/10 of the place immediately to its left. For example, in the number 70,070, the 7 in the ten-thousands place is worth 70,000, which is 1,000 times the 7 in the tens place at 70. A common misconception is that identical digits have the same value anywhere, but positions differ by powers of 10. Place value relationships allow comparisons across distant places by calculating factors of 10. This knowledge is essential for understanding number magnitude and operations.

8

A recipe uses $2.5$ cups of flour. In $2.5$, the digit 2 is in the ones place and the digit 5 is in the tenths place (adjacent places). Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. Which statement about the digit 5 is correct?

The digit 5 has a value of 5 because it is the digit 5.

The digit 5 has a value of 50 because the tenths place is 10 times the ones place.

The digit 5 has a value of 0.5 because it is in the tenths place.

The digit 5 has a value of 0.05 because the tenths place is to the left of the hundredths place.

Explanation

The value of a digit in a number depends on its position or place in the number. Each place value is 10 times greater than the place immediately to its right. Similarly, each place value is 1/10 of the place immediately to its left. For example, in the number 2.5, the digit 5 in the tenths place has a value of 0.5, which is 1/10 of the ones place. A common misconception is that tenths equal ones in value, but tenths are 0.1 times the digit. Place value enables comparison between whole and decimal parts of numbers. This understanding facilitates addition and subtraction across the decimal point.

9

In the number $9{,}340.215$, the digit 2 is in the tenths place and the digit 1 is in the hundredths place (adjacent places). Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. Which statement about the value of the digit 1 is correct?

The digit 1 has a value of 0.11 because you add the tenths and hundredths values.

The digit 1 has a value of 0.01, and it is $\tfrac{1}{10}$ of 0.1 in the tenths place.

The digit 1 has a value of 0.1 because the hundredths place is larger than the tenths place.

The digit 1 has a value of 1 because digits do not change value when they move.

Explanation

The value of a digit in a decimal number depends on its place relative to the decimal point. Each place value is 10 times the value of the place immediately to its right, meaning moving left multiplies the value by 10. Conversely, each place value is 1/10 of the value of the place immediately to its left, so moving right divides the value by 10. For example, in the number 9,340.215, the digit 1 in the hundredths place has a value of 0.01, which is 1/10 of the value a digit 1 would have in the tenths place at 0.1. A common misconception is that smaller places like hundredths have larger values due to more digits, but they are actually smaller fractions. Understanding place value relationships allows us to accurately compare decimals, such as seeing 0.01 is less than 0.2. This knowledge also aids in analyzing detailed numbers, like those in engineering or data, by breaking down each part's contribution.

10

A class records a time as $3.408$ minutes. The digit 4 is in the tenths place and the digit 0 is in the hundredths place (adjacent places). Remember: each place is 10 times the value of the place to its right and $\tfrac{1}{10}$ of the place to its left. Which statement about the value of the digit 4 is correct?

The digit 4 has a value of 4 because it is the digit 4.

The digit 4 has a value of 0.14 because you add the digit 4 and the tenths place value.

The digit 4 has a value of 0.4, which is 10 times the value of 0.04 in the hundredths place.

The digit 4 has a value of 0.04 because the tenths place is $\tfrac{1}{10}$ of the hundredths place.

Explanation

The value of a digit in a decimal number depends on its place relative to the decimal point. Each place value is 10 times the value of the place immediately to its right, meaning moving left multiplies the value by 10. Conversely, each place value is 1/10 of the value of the place immediately to its left, so moving right divides the value by 10. For example, in the number 3.408, the digit 4 in the tenths place has a value of 0.4, which is 10 times the value a digit 4 would have in the hundredths place at 0.04. A common misconception is that you add place values together to find a digit's worth, but each digit's value is independent and position-based. Understanding place value relationships allows us to accurately compare timings or measurements, such as 0.4 minutes versus 0.08 minutes. This knowledge also enhances our ability to round or estimate decimals effectively in practical scenarios.

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