Compare Fractions: Determine the Sign Between 3/8 and 1/4

Fraction Comparison with Common Denominators

Fill in the missing sign:

3814 \frac{3}{8}☐\frac{1}{4}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:05 Let's learn how to find the right sign.
00:08 First, let's find a common denominator to make things easier.
00:13 So, we'll multiply the whole fraction by 2 to match it up.
00:18 Make sure you multiply both the top number, called the numerator, and the bottom number, the denominator.
00:25 Awesome! Now, both fractions share the same denominator.
00:30 Here's a tip: When the bottoms are equal, the fraction with the bigger top number is larger.
00:38 Great job! And that's how we solve this math problem.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Fill in the missing sign:

3814 \frac{3}{8}☐\frac{1}{4}

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the denominators of the fractions 38\frac{3}{8} and 14\frac{1}{4}.
  • Step 2: Determine the least common denominator of 8 and 4.
  • Step 3: Convert each fraction to have this common denominator.
  • Step 4: Compare the fractions by examining their numerators.

Let's begin by determining the least common denominator (LCD) of the fractions:

The denominators are 8 and 4. The least common multiple (LCM) of these two numbers is 8.

Convert each fraction to an equivalent fraction with the common denominator of 8:

  • 38\frac{3}{8} already has the denominator 8, so it remains 38\frac{3}{8}.
  • For 14\frac{1}{4}, convert by multiplying the numerator and denominator by 2:
  • 14=1×24×2=28\frac{1}{4} = \frac{1 \times 2}{4 \times 2} = \frac{2}{8}.

Now, compare these equivalent fractions: 38\frac{3}{8} and 28\frac{2}{8}.

Since 3>23 > 2, it follows that 38>28\frac{3}{8} > \frac{2}{8}.

Therefore, the correct sign for the missing space is >>.

Thus, 38>14\frac{3}{8} > \frac{1}{4}.

3

Final Answer

> >

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert fractions to common denominator before comparing numerators
  • Technique: Use LCD method: 14=28 \frac{1}{4} = \frac{2}{8} when comparing to eighths
  • Check: Verify 38>28 \frac{3}{8} > \frac{2}{8} since 3 > 2 ✓

Common Mistakes

Avoid these frequent errors
  • Comparing numerators without converting to common denominators
    Don't compare 3 and 1 directly from 38 \frac{3}{8} and 14 \frac{1}{4} = wrong conclusion! Different denominators mean different-sized pieces, so you can't just compare the top numbers. Always convert both fractions to the same denominator first.

Practice Quiz

Test your knowledge with interactive questions

Fill in the missing sign:

\( \frac{5}{25}☐\frac{1}{5} \)

FAQ

Everything you need to know about this question

Why can't I just compare 3 and 1 from the numerators?

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Because the fractions have different denominators! 38 \frac{3}{8} means 3 pieces out of 8, while 14 \frac{1}{4} means 1 piece out of 4. These are different-sized pieces, so you must convert to compare fairly.

How do I find the least common denominator quickly?

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Look for the larger denominator first. If the smaller denominator divides evenly into the larger one (like 4 into 8), then the larger number is your LCD. Otherwise, find the LCM of both denominators.

What if both fractions already have the same denominator?

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Lucky you! When denominators are the same, just compare the numerators directly. The fraction with the larger numerator is the larger fraction.

Can I convert to decimals instead?

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Yes, but be careful with rounding! 38=0.375 \frac{3}{8} = 0.375 and 14=0.25 \frac{1}{4} = 0.25 . The common denominator method is more precise and shows your mathematical reasoning clearly.

What if the LCD is a really big number?

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That's okay! Even if the LCD seems large, the method still works. Just be careful with your arithmetic when multiplying numerators and denominators. Double-check your conversions before comparing.

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