Decimal Comparison: Finding the Maximum Value of 0.31

Decimal Comparison with Place Value Analysis

Determine which of the following numbers is larger than 0.31 0.31 :

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Choose the larger number than the given number
00:03 Let's compare the digits of the numbers
00:07 We can always add 0 to the right side of the last digit
00:10 The digit 1 is greater than 0, therefore the number is larger
00:13 Let's check the next number, using the same method
00:23 The digit 0 is less than 1, therefore the number is smaller
00:27 Let's check the next number, using the same method
00:31 The digit 0 is less than 1, therefore the number is smaller
00:36 Let's check the next number, using the same method
00:40 We can see that these numbers are equal
00:43 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Determine which of the following numbers is larger than 0.31 0.31 :

2

Step-by-step solution

In order to determine the correct answer, let's first add 0 to the number 0.31 in the following way:

0.31=0.310 0.31=0.310

In other words, we need to find a number that is greater than 310

Let's observe the answers:

0.311 - Given that the thousandths digit is 1 and 1 is greater than 0, this is the correct answer.

0.309 - Due to the fact that the hundredths digit is 0 and 0 is less than 1, this is not the correct answer.

0.3 - If we add two zeros we obtain the number 0.300. Given that the hundredths digit is 0 and 0 is less than 1, this is not the correct answer.

0.31 - If we add 0 to the number we obtain 0.310. Due to the fact that the thousandths digit is 0 and 0 is less than 1, this is not the correct answer.

3

Final Answer

0.311 0.311

Key Points to Remember

Essential concepts to master this topic
  • Rule: Compare decimals digit by digit from left to right
  • Technique: Add trailing zeros: 0.31 = 0.310 for easier comparison
  • Check: Convert to thousandths place: 0.311 > 0.310 > 0.309 ✓

Common Mistakes

Avoid these frequent errors
  • Assuming more digits means smaller number
    Don't think 0.311 is smaller than 0.31 because it has more digits = wrong comparison! This confuses whole number rules with decimal rules. Always compare place values systematically from left to right.

Practice Quiz

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Which decimal number is greater?

FAQ

Everything you need to know about this question

Why can I add zeros to the end of decimals?

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Adding trailing zeros doesn't change the value! 0.31=0.310=0.3100 0.31 = 0.310 = 0.3100 because the zeros represent no additional value in those decimal places.

How do I compare decimals with different numbers of digits?

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Make them the same length by adding zeros, then compare digit by digit. For example: 0.3=0.300 0.3 = 0.300 vs 0.31=0.310 0.31 = 0.310 , so 0.31 is larger.

Which place value should I look at first?

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Always start with the leftmost digit after the decimal point (tenths place), then move right to hundredths, then thousandths, and so on.

What if the tenths and hundredths places are the same?

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Keep moving right! Compare the thousandths place next. Like comparing 0.310 and 0.311 - since 1 > 0 in the thousandths place, 0.311 is larger.

Can I convert decimals to fractions to compare them?

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Yes, but it's usually harder! 0.31=31100 0.31 = \frac{31}{100} and 0.311=3111000 0.311 = \frac{311}{1000} . The place value method is much faster for decimal comparison.

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