- Amultiply by 5, root 90
- Bmultiply by 3, root 78
- Cmultiply by 5, root 81
- Dmultiply by 9, root 120
Step-by-Step Solution
1620 = 5. The unpaired factor is 5, so multiply by 5: . The square root is 90.
Answer: A) multiply by 5, root 90
Find the smallest number by which 1620 must be multiplied so that the
product is a perfect square. Then find the square root of that product.
Class 8Finding Square RootsSquares and Roots
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Finding Square Roots practice questions
More Class 8 Finding Square Roots practice
Find the least number that must be added to 6203 to make it a perfect square, and give…The teacher writes that for any perfect square, the number of odd numbers added in…Repeated subtraction of consecutive odd numbers from 81 gives: 81 - 1 = 80, 80 - 3 = 77,…A school wants the smallest number of students (more than 100) that can be arranged BOTH…The unit digit of a perfect square cannot be which of the following?