Question: How many whole numbers are between $ \sqrt20 $ and $ \sqrt50 $? (Use $ \sqrt20 \approx 4.47 $, $ \sqrt50 \approx 7.07 $)

How Many Whole Numbers Lie Between √20 and √50?

Calculating exact whole numbers between square roots might seem tricky at first, but with a simple approximation, it becomes easy to solve even for beginners. In this article, we’ll explore how many whole numbers fall strictly between √20 and √50 using the known approximations:
√20 ≈ 4.47 and √50 ≈ 7.07.

Step-by-Step Breakdown

Understanding the Context

First, identify the square root values:

√20 is approximately 4.47, meaning it’s slightly above 4 but less than 5.
√50 is approximately 7.07, just over 7 but less than 8.

Since we’re looking for whole numbers between these two values (not including the roots themselves), we focus on the integers that lie strictly greater than 4.47 and strictly less than 7.07.

The whole numbers satisfying:
4.47 < n < 7.07
are:

Now, check which of these are strictly between 4.47 and 7.07:

5 is greater than 4.47 and less than 7.07 → valid
6 is also within the range → valid
7 is less than 7.07 but greater than 4.47 → valid

$Question: How many whole numbers are between $ \sqrt{20} $ and $ \sqrt{50} $? (Use $ \sqrt{20} \approx 4.47 $, $ \sqrt{50} \approx 7.07 $)$

Key Insights

However, note that 7.07 is just over 7, but 7 is still strictly less than √50 ≈ 7.07. So 7 is included.

Final Count

The whole numbers between √20 and √50 are: 5, 6, and 7 — a total of 3 whole numbers.

Why This Matters

Understanding intervals between square roots helps build foundational skills in number theory, estimation, and approximations — essential for more advanced math like algebra and calculus. Recognizing whole numbers within irrational bounds such as √20 and √50 strengthens number sense and mental math abilities.

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Final Thoughts

Conclusion

Between √20 (≈4.47) and √50 (≈7.07), there are exactly three whole numbers: 5, 6, and 7. This simple yet powerful insight shows how approximating square roots makes whole number counting intuitive and accessible.

Key Takeaways:

√20 ≈ 4.47 → first whole number above this is 5
√50 ≈ 7.07 → whole numbers below this include 5, 6, 7
Only these three whole numbers fit strictly between √20 and √50

Perfect for math students and educators seeking clear, practical explanations on estimating roots and counting whole numbers.