Loading…
Math Tutor's Solution: The square root of 391 is 19.774
Methods
What is the Square Root of 391?
The definition of the square root of a number is the value that, when multiplied by itself, gives the original number. For example, the square root of 25 is equal to 5, because 5 x 5 = 25. Expressed in a radical form: √25 = 5. Therefore, solving for the Square Root of 391, we find that the square root of 391 is 19.774. Always remember: your answer can be either a whole number or a decimal.
Is the Square Root of 391 irrational?
A math tutor would teach that numbers can be categorized into subsets called rational and irrational numbers. An example of irrational numbers are decimals that have no end or are non-terminating. A common confusion is that because a decimal has no end it is a large number that tends to infinity, whereas that isn’t true.
Take a look at the exponential constant e, e has a value of 2.7182818… and is non-terminating but not a huge value because at the end of the day e will never be greater than 3. On the other hand, rational numbers are decimals that can be written as fractions that divide two integers (as long as the denominator is not 0). Thus, for this problem, since the square root of 391, or 19.774, is a non-terminating decimal, so the square root of 391 is irrational.
Methods to find the Square Root of 391
To begin, there are two ways to calculate the Square Root of a number: Prime Factorization and Long Division. Usually, Prime Factorization is used for perfect squares and the long division is used when the value of the square root is a decimal.
Since we know that 391 is decimal, we know that the appropriate method would be long division. This method works very similar to regular long division except in this method, there are some more rules that help us arrive at the answer. Take a look at this example that walks through in detail about what this method is, how to use it, and provides several solved examples. Therefore, the result after using the long division method is 19.774.
Math Tutor Suggests: Find The Square Root of Other Numbers
Finding the square root of any number can be done using the same method as shown above. Take a look at how to find the square root of these other specific examples from our math tutors by clicking on any of the links below:
Download FREE Math Resources
Take advantage of our free downloadable resources and study materials for at-home learning.
8 Math Hacks and Tricks to Turn Your 'Okay' Math Student Into a Math Champion!
One thing we teach our students at Thinkster is that there are multiple ways to solve a math problem. This helps our students learn to think flexibly and non-linearly.
Get PDF
Math Tutoring to Boost Your Child’s Math Skills & Scores by 90% in Just 3 Months – Guaranteed!
Does your child struggle with math homework or understanding tricky math concepts? Do they do okay in math, but express excitement to learn new material or advanced math?
A Thinkster Math tutor provides one-to-one support to help elementary, middle school, and high school students build confidence and master math subjects like K-8 math, pre-algebra, algebra, geometry, calculus, and more.
Our expert math tutors customize math lessons to your child’s unique needs, making learning math fun and effective. We help students improve grades, develop strong critical thinking skills through solving word problems, excel in standardized tests, and develop strong problem-solving skills.
Our expert math tutors are ready to help make your child a champion and develop strong math mastery! Sign up for our 7-day free trial and get the best math tutor for your child today!
Start 7-Day Free Trial