Question

10. If the unit digit of a perfect square number is 9 then what will be the unit digit of its squareroot? ਜੇਕਰ ਕਿਸੇ ਪੂਰਨ ਵਰਗ ਸੰਖਿਆ ਦਾ ਇਕਾਈ ਦਾ ਅੰਕ 9 ਹੈ ਤਾਂ ਉਸਦੇ ਵਰਗਮੂਲ ਦਾ ਇਕਾਈ ਅੰਕ ਕੀ ਜੋਵੇਗਾ? *
9
3 or 7
1
1 or 9​

Answer 1

Answer:

3 or 7

,,,,,,,,,,,.........

Answer 2

Given : unit digit of a perfect square number is 9

To Find  :  what will be the unit digit of its squareroot

9

3 or 7

1

1 or 9​

Solution:

1² = 1

2² = 4

3² = 9

4² = 16

5² = 25

6² = 36

7² = 49

8² = 64

9² = 81

10² = 100

Ending with 9 are     3²  and 7²

Hence if  unit digit of a perfect square number is 9  

Then unit digit of Square root will be 3 or 7

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