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Square Root Tricks

Square Root Tricks
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Square Root Tricks

Knowing square root tricks to find the square root of numbers proves to be very helpful when you are solving complex equations which will not take much time for getting solved. Tips and tricks help us to solve mathematical problems easily and quickly. Hence, we have brought here some useful tips to find the square root of a given number even without using a calculator. The concept of squares and the square root is broadly explained in class 8 syllabus.




What is Square Root?

The square root of a number is the value which when multiplied to itself gives the original number. Suppose, 5 when multiplied by 5 results in 25. So we can say, 5 is the square root value of 25. Similarly, 4 is the root value of 16, 6 is the root value 36, 7 is the root value of 49, etc. Since square represents the area of a square which is equal to ‘side x side’, therefore, square root represents the length of the side of the square. The symbol of the square root is denoted by ‘√’. Hence, square root numbers are represented as √4, √5, √8, √9, etc.

How to Find Square Root?

To find the square root of small numbers like 4, 9, 16, 25, etc. is an easy task. Because we already know from the multiplication table of 1 to 10, the number when multiplied by itself gives the squares, in a two-digit form. But if the number is in three-digit or four-digit, then it is difficult to find the root of these numbers, because we cannot remember the table for higher numbers. Let us find out the trick to determine the root of large numbers.

Example 1:  Suppose we need to find the square root of large numbers such as 4489.

Step 1: The unit digit in this number is 9, which can be a unit digit of its square root number such as 3 or 7. Because 32 is 9 and 72 is 49.

Step 2: Now let us consider the first two digits that is 44 which comes between the squares of 6 and 7 because 62 < 44< 72

Step 3: We can assume that the ten’s digit of the square root of 4489 is the lowest among the two numbers i.e. 6 and we need to find the unit digit of the square root of the number 4489.

Step 4: Now, we need to find between 63 or 67 which is the square root of 4489.

Step 5: Since the ten’s digit is 6 and the next number is 7, we need to multiply both the numbers like 6 x 7 = 42 and since 42 is less than 44.

Step 6: Square root of 4489 will be the bigger number between 63 and 67 i.e. 67.

Therefore, √4489 = 67

Example 2: Let us have a look at another example, the square root of 7056.

Here is the step by step method:

  • Now, consider the unit digit that is 6. Which all numbers have the unit digit 6 on their square roots. That are 4 and 6 because 42 is 16 and 62 is 36
  • Now let’s consider the first two digits that is 70 which comes between the squares of 8 and 9 because of 82 < 70 <92
  • We can assume that the ten’s digit of the square root of the 7056 is the lowest among the two numbers that is 8
  • Now, we need to find the unit digit of the square root of the number 7056. For that, we need between 84 and 86 which is the square root of 7056
  • Since the ten’s digit is 8 and the next number is 9, we need to multiply both the numbers like 8 x 9 = 72 and since 72 is bigger than 70
  • Square root of 7056 will be the lesser number between 84 and 86 that is 84

Therefore, √7056 = 84

Just like this method, you can get various square roots tricks pdf on the web for finding the square roots of large numbers and with these tricks, you could solve an equation within no time.


👇 Watch Video Lesson 👇




Square Root Chart From 1 to 50

You can also memorise the square root table from numbers 1 to 50, to solve problems based on them. Here is the list available:

NumberSquare Root Value(√)
11
21.414
31.732
42
52.236
62.449
72.646
82.828
93
103.162
113.317
123.464
133.606
143.742
153.873
164
174.123
184.243
194.359
204.472
214.583
224.69
234.796
244.899
255
265.099
275.196
285.292
295.385
305.477
315.568
325.657
335.745
345.831
355.916
366
376.083
386.164
396.245
406.325
416.403
426.481
436.557
446.633
456.708
466.782
476.856
486.928
497
507.071


About the Author

At the helm of GMS Learning is Principal Balkishan Agrawal, a dedicated and experienced educationist. Under his able guidance, our school has flourished academically and has achieved remarkable milestones in various fields. Principal Agrawal’s visio…

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