Question

The 9's complement of 381 is

Answer 1

Answer:

the 9's complement of 381 is 618

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Answer 2

The 9's complement of 381 is 618.

• The 9's complement of a number is given by subtracting each digit of the number from 9.

• For a three digit number, the number has to subtracted from three 9's, i.e, 999.

• ∴  The 9's complement of 381 can be obtained by subtracting the number from 999.

=> The 9's complement of 381 = 999 - 381

Or, The 9's complement of 381 = 618.

• In other words, it can be said that, 9's complement of a digit is the digit which gives 9 on getting added to it.

• Here,

for 3, it is 6 (3 + 6 = 9) ;

for 8, it is 1 (8 + 1 = 9) ;

and for 1 it is 8 (1 + 8 = 9) .