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Last digits for the square of 1 and 9 are 1

Last digits for the square of 2 and 8 are 4

" " " " " " 3 and 7 are 9

" " " " " " 4 and 6 are 6

Cube root-

1-1

2-8

3-7

4-4

5-5

6-6

7-3

8-2

9 -9

Square root-

1 & 9 - 1

2 & 8 - 4

3 & 7 - 9

4 & 6 - 6

Cube root-

1 - 1

2 - 8

3 - 7

4 - 4

5 - 5

6 - 6

7 - 3

8 - 2

9 - 9

this will give you idea about the last digit of the sq root or cube root

dont worry if you cant remember them they are the unit digit of the sq or cube of the same no.