# Shortcuts On Finding The Square Root

**Shortcuts on Finding Square
Roots**

**Finding the square
root of a 4-digit perfect square ending in 5**

Sample Problem Number One :

Find the square root of 5675

Step One : Drop the first two digits of the square . 56

Step Two: Find the largest square root of the remaining digits. This is the first digit of

The square root. Find the largest root in 56 :

7 X 7 = 49

The first digit in the square root is 7

Step Three : Append 5 to 7 =è75

Therefore the square root of 5625 is 75.

Sample Problem Number Two:

Find the square root of 7225

Step One : 72

Step Two : Find the largest square root in 72.

8 X 8 = 64

The first digit in the square root is 8.

Step Three : Append 5 to 8

Therefore the square root of 7225 is 85.

Sample Problem Three : Find the square root of 3025

Step One : 30

Step Two; Find the largest square root in 30

5 X 5 = 25

The first digit in the square root is 5.

Step Three : Append 5 to 5

Therefore the square root of 3025 is 55.

Sample Problem Number Four : Find the square root of 9025

Step One : 90

Step Two : Find the largest square root in 90

9 X 9 = 81

The first digit in the square root is 9.

Step Three : Append 5 to 9

Therefore the square root of 9025 is 95.

## More by this Author

- 108
TOPIC: PROBLEM SOLVING INVOLVING RATIONAL EQUATION FEATURING: WORK PROBLEM MOTION PROBLEM TOPIC OBJECTIVES: At the end of the lesson the students are expected to: 1. Gain skill in solving...

- 5
Solving Investment Problems One of the most important applications of linear equations is found in solving investment problems. Investment problems use the Simple Interest formula I = Prt, where P =...

- 14
Solving Word Problems Involving Quadratic Equation One of the most important topics in Algebra is solving quadratic equations. It has found wide applications in many areas of Mathematics. This hub presents...

## Comments 20 comments

cristina, thank you for helping me figure this out again! It's been some time, math is and can be fun, but I opted for speaking and writng. Keep up the good work! Merry Christmas to you and your family!!!

This is fun. How about Statistics. Maybe you can share it too. Thank you for sharing this. More power.

vvvvvvv gooooood method!!!!!!!!!!!!!!!!!!!!!!!!

its interesting &very goooood,easy method...

but what abt other numbers which r not perfect squares &

not ending with 5...

thank u but what about other numbers that are placed in last digit place

Thank u and it is very simple..what abt the other numbers in units place??

Thanks...

Its really good one

XCLENT THANK U VERY MUCH

Thanks, cristina. I hadn't seen your square-root method before. To answer raviindra's question, there is a slightly more general method for finding the square root of four-digit perfect squares.

Example: Find the square root of 2401.

Step 1. This time, temporarily drop the LAST two digits, and temporarily replace them with zeros.

Result = 2400.

Step 2. What's the largest two-digit number, ending in zero, whose square is less than or equal to 2400?

Result = 40.

Write down "4_".

Step 3. Now look at the last digit, which is a "1".

Step 4. How many two-digit perfect squares end in a "1"?

Step 5. The two possible results are 1, whose square root is obviously 1; and 81, whose square root is 9.

Step 6. Add the two square roots from Step 5 to the Step 2 result. The two results are:

4_ + 1 = 41 and 4_ + 9 = 49

Step 7. Test ONE of the two square root candidates from the previous step, which are 41 and 49, in this example.

The square of 41 is NOT 2401.

Therefore the square root of 2401 is 49.

Note. If the four-digit perfect square ends in "4", "5", or "9", Step 7 will be faster, and you can do the entire calculation mentally. You won't need a calculator or a slide rule.

Sure It is useful so I should vote.

Thanks for sharing your Math skills.

How to find the square root of 62025

thank you for helping me to find square root of numbers!but what happen when the number is not a correct square

It is truly interesting the many ways to find the square root of a number, some are simple as you show here and others are explained in such a complex language. But there is another way to find the square root of numbers that are not a perfect square and have decimals. It is by using the algorithm method, and it really is not that complex at all. Before computers it was taught in high schools. I have it explained as best as I can on my hub so I won't go into it here, check it out if you like.

Thanks for Tips of Shortly Find Squre Root

o.k.

sq root of 52684

Oh my! Thank you so much for this shortcut! It really helps me a lot!

Thank You!!! :)

20