Question

By which smallest number 90 must be multipled so as to make a perfect square?​

Answer 1

Answer:

10

Step-by-step explanation:

The smallest to be multiplied with 90 so as to obtain a perfect square is 10.

$90 \times 10 = 900 \\ \\ \sqrt{900} = 30$

Answer 2

The answer is 10.
For these questions, you need to find the prime factors of 90. They are:
2,3,3,5.
Now, try to group them into pairs of same numbers. 3 is getting grouped but not 2 and 5.
To make groups of 2 and 5, we must multiply them with 90.
90*2*2 = 90*10 = 900
The root of 900 is 30.

Hope it helps.