Maximum Value Comparison: Identifying the Largest Number

Radical Expressions with Fraction Simplification

Choose the largest value

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Choose the largest value
00:03 Calculate the quotient of each expression
00:06 Apply this method for each expression and determine the largest one
00:11 The larger the number in the root, the larger its value
00:17 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Choose the largest value

2

Step-by-step solution

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

  • Step 1: Simplify each expression using the Square Root Quotient Property.
  • Step 2: Compare the simplified values to identify the largest one.

Let's simplify each expression:

Choice 1: 255 \sqrt{\frac{25}{5}}
Simplify: 255=52.236 \sqrt{\frac{25}{5}} = \sqrt{5} \approx 2.236 since 255=5 \frac{25}{5} = 5 .

Choice 2: 366 \sqrt{\frac{36}{6}}
Simplify: 366=62.449 \sqrt{\frac{36}{6}} = \sqrt{6} \approx 2.449 since 366=6 \frac{36}{6} = 6 .

Choice 3: 497 \sqrt{\frac{49}{7}}
Simplify: 497=72.646 \sqrt{\frac{49}{7}} = \sqrt{7} \approx 2.646 since 497=7 \frac{49}{7} = 7 .

Choice 4: 648 \sqrt{\frac{64}{8}}
Simplify: 648=82.828 \sqrt{\frac{64}{8}} = \sqrt{8} \approx 2.828 since 648=8 \frac{64}{8} = 8 .

Upon comparing the values, 82.828 \sqrt{8} \approx 2.828 is the largest.

Therefore, the largest value is 648 \sqrt{\frac{64}{8}} .

3

Final Answer

648 \sqrt{\frac{64}{8}}

Key Points to Remember

Essential concepts to master this topic
  • Simplify First: Calculate the fraction inside the radical before taking square root
  • Technique: 648=8 \sqrt{\frac{64}{8}} = \sqrt{8} since 64 ÷ 8 = 8
  • Check: Compare decimal approximations: √8 ≈ 2.828 is largest ✓

Common Mistakes

Avoid these frequent errors
  • Comparing the original fractions instead of simplifying first
    Don't compare 25/5, 36/6, 49/7, and 64/8 directly = wrong order! The fractions look similar but have different values. Always simplify the fraction inside each radical first, then compare the resulting square roots.

Practice Quiz

Test your knowledge with interactive questions

Choose the expression that is equal to the following:

\( \sqrt{a}:\sqrt{b} \)

FAQ

Everything you need to know about this question

Why can't I just compare the numerators to find the largest?

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The numerators alone don't tell the whole story! Even though 64 is the largest numerator, you need to divide by the denominator first. For example, 497=7 \frac{49}{7} = 7 but 648=8 \frac{64}{8} = 8 .

Do I need to calculate exact decimal values?

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Not always! You can compare perfect squares directly. Since 8 > 7 > 6 > 5, we know 8>7>6>5 \sqrt{8} > \sqrt{7} > \sqrt{6} > \sqrt{5} without calculating decimals.

What if the fraction doesn't simplify to a whole number?

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That's fine! You can still compare square roots of any positive numbers. If a>b a > b , then a>b \sqrt{a} > \sqrt{b} always holds true.

Can I use a calculator for this type of problem?

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Yes, but try the mental math approach first! Simplifying fractions like 64÷8=8 is faster than calculating decimal approximations, and it builds your number sense.

How do I remember which square root is larger?

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Remember: larger input means larger output for square roots. Since √8 has the largest number under the radical, it gives the largest result!

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