Question

What least number must be subtracted
from 2605 to make it perfect square ? ​

Answer 1

Answer:

4

Because,

51 * 51 = 2605 - 4

51 * 51 = 2601

MARK AS BRAINLIEST !!

Answer 2

Answer:

4 must be subtracted from 2605 to make it a perfect square (2601 = 51^2)

Step-by-step explanation:

A perfect square is a number that can be expressed as the product of two equal integers.

The only way to accurately calculate if a number is a perfect square is to find the factors. Before we go through the trouble of finding the factors, there is a quick trick you can use to help determine if you need even need to do the extra work.

Try these steps first:

A number that is a perfect square never ends in 2, 3, 7 or 8. If your number ends in any of those numbers, you can stop here because your number is not a perfect square.

Obtain the digital root of the number. The digital root essentially is the sum of all of the digits. If you're lost, don't worry, we'll go over each step in more detail below.

All possible numbers that are a perfect square have a digital root of 1, 4, 7, 9.

Let's try it...

Step 1:

What is the last number of 2,601? It is this number: 2601. The answer is 1. Is 1 in the list of numbers that are never perfect squares (2, 3, 7 or 8)?

Step 2:

We now need to obtain the digital root of the number. Here's how you do it:

Split the number up and add each digit together:

2 + 6 + 0 + 1 = 9

What is the digital root of number 2,601?

Answer: 9