Number Systems and Data Representation

Converting between binary, octal, decimal and hexadecimal number systems, and understanding how text is encoded using ASCII and Unicode.

11 min readWeightage: CBSE Class 9 Computer Science — 3-4 marks30-question chapter test included

Check Your Chapter Preparation

Admissions open

Want this taught live? ICSE / IGCSE 2027 & 2028 batches

Number Systems and Data Representation (Computer Science) is part of the ICSE & IGCSE syllabus plan. Pick the batch by the year you appear in — Class 11 students join the two-year ICSE / IGCSE 2028 program, Class 12 students and repeaters join the one-year or crash program for ICSE / IGCSE 2027.

ICSE / IGCSE 2027 online coaching — 1 year Class 12 batchFull syllabus, revision and test series for the ICSE & IGCSE 2027 attempt in batches of 20 — every formula here is drilled through daily practice.
ICSE / IGCSE 2028 two year course for Class 9-10 studentsStart early: a two-year ICSE & IGCSE 2028 program that builds concepts alongside school, with board-level support.
1-on-1 ICSE / IGCSE 2027 & 2028 tutoring at $15 per hourPersonal mentor, flexible timings and a plan built around the chapters you keep losing marks in.

Finished this chapter? Test yourself now.

30 questions graded from basic to exam level, with a question-wise result and a personalised improvement plan.

Start Chapter Test