(137) base is 8, so this is octal:
Convert to Binary:
4 2 1 4 2 1 4 2 1
0 0 1 0 1 1 1 1 1
Answer is:1011111
Conversion to hexadecimal:
8 4 2 1 8 4 2 1
0 1 0 1 1 1 1 1
5 F
Answer is: 5F
Convert to Decimal:
137
64 8 1
1 3 7 in this section you should multiply with place value
64 + 24 + 7 In this section add the all value’s
Answer is:95 base value is 10
Convert fractional octal to (21.21) base value is 8:
↑ ↑
MSD LSD
= 2 x 81 + 1 x 80 . 2 x 8-1 + 1 x 8-2
= 2 x 8 + 1 x 1 . 2 x ( 1 / 8 ) + 1 x ( 1 / 64 )
= 16 + 1 . ( 0. 2 5 ) + ( 0 . 0 1 5 6 2 5 )
= 17 + 0. 265625
Problem 2: Convert ( 0.357 )8= ( ? )10
= 0 . 3 5 7
↑ ↑
MSD LSD
= 0 x 80 . 3 x 8-1 + 5 x 8-2 + 7 x 8-3
= 0 x 1 . 3 x ( 1 / 8 ) + 5 x ( 1 / 64 ) + 7 x ( 1 / 512 )
= 0 . (0. 375) + (0 . 0 7 8 1 2 5 ) + ( 0.013671875 )
= 0 . ( 0 . 466796875 )
= 1 0 0 . 0 1
↑ ↑
= 1 x 82 + 0 x 81 + 0 x 80 . 0 x 8-1 + 1 x 8-2
= 1 x 64 + 0 x 8 + 0 x 1 . 0 x ( 1 / 8 ) + 1 x ( 1 / 64 )
= 64 + 0 + 0 . ( 0 ) + ( 0. 015625 )
= 64 . ( 0. 015625 )
Therefore ( 1 0 0 . 0 1 )8 = ( 64 . 0 1 5 6 2 5 )10