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IGCSE Computer Science 0478 — 1.1 Number Systems

Binary, denary and hexadecimal — converting between them, adding binary, shifting bits and two's complement.

Modules (34)

Printables for this journey

Every module above has its own free printable worksheet with an answer key. These crosswords and word searches cover the same terms:

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Years 5–6 Digital Systems Crossword: Inside digital systems and Data and networks (Modules 11–20) 10 clues · Cloud storage, Motherboard, Graphics processing unit (GPU), Network interface (wired and wireless adapter) and more
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Years 5–6 Digital Systems Word Search: Inside digital systems and Data and networks (Modules 1–20) 20 words to find · Digital system, Hardware, Software, Input, process, output and storage and more
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Years 5–6 Data & Information Crossword: Data, information and binary representation (Modules 1–10) 10 clues · Data and information, Types of data: numbers and text, Types of data: images, sound and video, Same data, different representations and more
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Years 5–6 Data & Information Word Search: Data, information and binary representation and Acquiring and manipulating data (Modules 1–20) 20 words to find · Data and information, Types of data: numbers and text, Types of data: images, sound and video, Same data, different representations and more
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Years 7–8 Data & Information Crossword: Representing data with binary and Acquiring, storing and validating data (Modules 9–45) 10 clues · 8-bit binary numbers and the range 0 to 255, Converting a larger decimal number to binary, How many values n bits can store, Looking up characters in the ASCII table and more
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Years 7–8 Data & Information Word Search: Representing data with binary to Using digital tools and conventions (Modules 9–80) 22 words to find · 8-bit binary numbers and the range 0 to 255, Converting a larger decimal number to binary, How many values n bits can store, Looking up characters in the ASCII table and more
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Crossword: 1.1 Number Systems (Modules 3–17) 10 clues · Number bases: denary, binary and hexadecimal, Denary place values, 16-bit binary place values, Converting 16-bit binary to denary and more
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Crossword: 1.1 Number Systems (Modules 18–27) 10 clues · Converting hexadecimal to binary using nibbles, Why hexadecimal is used instead of binary, Where hexadecimal is used in computer science, Binary addition rules and more
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Crossword: 1.1 Number Systems and 1.2 Text, Sound and Images (Modules 28–41) 10 clues · Why two's complement is used, The sign bit worth -128, Range of 8-bit two's complement, Converting 8-bit two's complement to denary and more
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Word Search: 1.1 Number Systems (Modules 3–27) 22 words to find · Number bases: denary, binary and hexadecimal, Denary place values, 16-bit binary place values, Converting 16-bit binary to denary and more
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Word Search: 1.1 Number Systems to 1.3 Data Storage and Compression (Modules 28–58) 20 words to find · Why two's complement is used, The sign bit worth -128, Range of 8-bit two's complement, Converting 8-bit two's complement to denary and more

Frequently Asked Questions

Are these worksheets free?

Yes — every worksheet and its answer key is free to view, download, and print, with no account required to access any individual module.

Do I need an account?

No account is needed to view or print a worksheet. A free teacher account adds extras like assigning modules to a class and tracking progress automatically — it takes under three minutes to set up and doesn't need a credit card.

What year level is this for?

This curriculum is aligned to the Australian Curriculum (ACARA) and Victorian Curriculum, spanning roughly Years 3 to 10 — from first sequencing and variables through to object-oriented programming and advanced data structures. Start wherever matches your class's current level; each module builds on the last.

Can I print them?

Yes — every module has a one-click Print Worksheet button that generates a printable page with the practice questions and a full answer key.

Is this aligned to a curriculum?

Yes — the module sequence is mapped to the Australian Curriculum (ACARA) and Victorian Curriculum, and a class's progress is reported back against those curriculum bands (e.g. ACARA Years 5–6 sequencing and iteration, Years 7–8 functions and data structures), not just a generic difficulty scale.

Can students use this without a teacher?

Yes — students can start any module and practice directly, no class or account required. Joining a teacher's class with a class code adds progress tracking, class badges, and live Sprints, but isn't needed to work through the worksheets or modules solo.

Do I need to know IGCSE Computer Science Paper 1 myself to teach this?

No — every module comes with a full worked answer key, and Cloodit tracks who's stuck automatically, so you don't need to solve each exercise yourself before assigning it or be able to debug a student's work line by line.

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