Understand Decimal Place Value Relationships

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5th Grade Math › Understand Decimal Place Value Relationships

Questions 1 - 10
1

Look at the number $62{,}718.043$. The digit 4 is in the hundredths place and the digit 3 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 about these two digits is correct?

The 4 is worth 4 and the 3 is worth 3, and the 4 is 1 more than the 3.

The 4 is worth 0.04 and the 3 is worth 0.003, and the 4 is more than 10 times the value of the 3.

The 4 is worth 0.4 and the 3 is worth 0.03, and the 4 is 10 times the value of the 3.

The 4 is worth 0.004 and the 3 is worth 0.03, and the 4 is 10 times the value of the 3 because places get bigger to the right.

Explanation

The value of a digit in a decimal number depends on its position or place relative to the decimal point. Each place to the left of another is 10 times greater in value than the place to its right. Conversely, each place to the right is 1/10 the value of the place to its left. For example, in 62,718.043, the 4 in the hundredths place is 4 × 0.01 = 0.04, and the 3 in the thousandths place is 3 × 0.001 = 0.003, so 0.04 is more than 10 times 0.003 (actually about 13.33 times) because 4 > 3. A common misconception is that place value relationships always yield exactly 10 times between adjacent places, regardless of digit values. Understanding place value enables us to compare digits' contributions across positions, even when they differ. This helps us comprehend the structure of decimals, improving skills in comparison and arithmetic.

2

A student moves the digit 5 in the number $18.52$ one place to the right to make $18.25$. The digit 5 started in the tenths place and moved to 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. How does the value of the digit 5 change?

The value becomes 10 times larger because moving right increases the value.

The value increases by 10 because each place changes by adding 10.

The value becomes $\tfrac{1}{10}$ as large because moving one place right makes the value 10 times smaller.

The value stays the same because the digit is still 5.

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, when moving the digit 5 from the tenths place in 18.52 to the hundredths place in 18.25, its value changes from 0.5 to 0.05, becoming 1/10 as large. A common misconception is that moving a digit right increases its value, but it actually decreases it by a factor of 10. Understanding place value relationships allows us to accurately compare how digits contribute in different positions, such as 0.5 versus 0.05. This knowledge also supports operations like addition or subtraction of decimals by aligning places correctly.

3

In the number $7{,}105.08$, 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 value of the digit 8 is correct?

The digit 8 has a value of 0.8 because hundredths are 10 times larger than tenths.

The digit 8 has a value of 0.008 because you add one zero each time you move left.

The digit 8 has a value of 0.08, which is $\tfrac{1}{10}$ of 0.8 in the tenths place.

The digit 8 has a value of 8 because the digit is 8 in any 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 7,105.08, the digit 8 in the hundredths place has a value of 0.08, which is 1/10 of the value a digit 8 would have in the tenths place at 0.8. A common misconception is that hundredths are larger than tenths because they sound more precise, but tenths are actually 10 times larger. Understanding place value relationships allows us to accurately compare decimals, such as recognizing 0.08 is smaller than 0.1. This knowledge also supports working with large numbers, like those in scientific or financial contexts, by clarifying decimal contributions.

4

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?

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

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 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.

5

A distance is recorded as $12.304$ kilometers. The digit 3 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 3 is correct?

The digit 3 has a value of 0.33 because you add the tenths and hundredths places together.

The digit 3 has a value of 0.3, and it is 10 times the value of 0.03 in the hundredths place.

The digit 3 has a value of 0.03 because it is next to the hundredths place.

The digit 3 has a value of 3 because the digit itself tells the value.

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 12.304, the digit 3 in the tenths place has a value of 0.3, which is 10 times the value a digit 3 would have in the hundredths place at 0.03. A common misconception is that adjacent places add their values together, but each place contributes independently based on its position. Understanding place value relationships allows us to accurately compare decimals, such as knowing 0.3 exceeds 0.04. This knowledge also enhances our ability to handle measurements, like distances, where decimals represent fractions of units.

6

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 8 because digits keep the same value in any place.

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

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 0.008 because the hundredths place is 10 times 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 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.

7

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 become $\tfrac{1}{10}$ as great.

Its value would become 10 times as great.

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

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.

8

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

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 0.4 because the tenths place is 10 times 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 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.

9

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 40 because it is next to the tens 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 4,000 because the hundreds place is 10 times the thousands 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.

10

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

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

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

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

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