Question

Exercise 4.1
1. Find the ones digit of the cube of the
following numbers.
(i) 81
(ii) 37 (iii) 65
(v) 244 (vi) 179 (vii) 222 (viii) 456
(ix) 128
(x) 240
(iv) 113​

Answer 1

dil bechara

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Unit digit of cube of any number will be the unit digit of cube of its last digit

For number 29. Unit digit of 29 3 = Unit digit of 9 3 ...

For number 77. Unit digit of 77 3 = Unit digit of 7 3 ...

1. For number 3331. ...
2. For number 8888. ...
3. For number 149. ...
4. For number 1005. ...
5. For number 1024. ...
6. For number 5022.