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JSS2: COMPUTER STUDIES - 1ST TERM

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  1. Computer Software | Week 1
    3 Topics
    |
    1 Quiz
  2. Operating System | Week 2
    9 Topics
    |
    1 Quiz
  3. Computer Memory: Primary And Secondary Memory | Week 3
    5 Topics
    |
    1 Quiz
  4. Computer Memory II: Secondary / Auxiliary / External Memory | Week 4
    3 Topics
    |
    1 Quiz
  5. Number System I | Week 5
    4 Topics
    |
    1 Quiz
  6. Number System II | Week 6
    2 Topics
    |
    1 Quiz
  7. Units of Storage In Computer | Week 7
    3 Topics
    |
    1 Quiz
  8. Problem Solving Skills With Computer | Week 8
    7 Topics
    |
    1 Quiz
  9. Computer Programming Languages | Week 9
    3 Topics
    |
    1 Quiz



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An Octal number is a number in base 8 and the place values increases in the power of 8.

Conversion from Decimal to Octal

The conversion is similar to binary conversion but the only difference is that rather than dividing by 2 for the binary number, we would divide by 8 for an octal number until the last number is zero.

The following steps could be taken. Continue to divide the decimal number by 8 until the last division is zero and save the remainder as in previous conversion.

Convert 400 to octal

Screen Shot 2021 03 16 at 5.01.39 PM

Answer – 40010 = 6208

Convert 12 decimal to octal

Screen Shot 2021 03 16 at 5.03.50 PM

Answer – 1210 = 148

Convert 10610 to octal

Screen Shot 2021 03 16 at 5.10.36 PM

Answer – 10610 =1528

Convert 1024 to base 8

Screen Shot 2021 03 16 at 5.11.38 PM

Answer – 102410 = 20008

We can also convert from other bases to Decimal as shown in the examples below

Convert 11110 to base 4

Screen Shot 2021 03 16 at 5.05.43 PM

Answer – 11110 = 12334

  Convert 28010 to hexadecimal

Screen Shot 2021 03 16 at 5.15.27 PM

Answer – 28010 = 11816

Conversion of Octal to Decimal

Both the expansion and place value method could be used.

Convert 7248 to decimal

Place value828180
Binary Number724
Screen Shot 2021 03 16 at 5.23.55 PM

Answer – 724= 46810   

Convert 210 8 to decimal

Place value828180
Binary Number210
Screen Shot 2021 03 16 at 5.25.52 PM

Answer – 2108 = 13710.

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