ACARA Digital Technologies Years 7–8 — Representing Text, Images and Sound
How computers store words, pictures and sound as numbers.
Modules (59)
1
Digital systems store everything as numbers
2
Binary means two states
3
Bits and the binary digits 0 and 1
4
Why digital hardware has two states
5
Encode and decode
6
Counting in binary from 0 to 7 (Representing Text, Images and Sound)
7
Counting in binary from 8 to 15 (Representing Text, Images and Sound)
8
Binary place values
9
Writing small numbers in binary
10
Reading binary numbers
11
Converting numbers from 0 to 127 using seven place values
12
Padding binary with leading zeros
13
How many values n bits can store
14
Representing text with number codes
15
Character set
16
Looking up characters in the ASCII table
17
ASCII codes for digits, spaces and punctuation
18
Converting a word to ASCII decimal codes
19
ASCII and its bits per character
20
Encoding a word as 8-bit ASCII binary
21
Decoding ASCII binary back into text
22
Unicode and emoji
23
Comparing ASCII and Unicode
24
Representing images with pixels
25
Reading a pixel grid row by row
26
Encoding a black-and-white image as 0s and 1s
27
Decoding 0s and 1s into an image
28
One bit gives two colours
29
Two bits give four shades: greyscale
30
More colours need more binary digits
31
Raster (bitmap) images
32
The RGB colour model
33
RGB values from 0 to 255
34
Reading RGB values for common colours
35
Black, white and greys in RGB
36
Inspecting a pixel's RGB numbers
37
Colour depth
38
Number of colours from the colour depth
39
24-bit colour: three bytes per pixel
40
Writing an RGB colour in binary
41
Image resolution
42
Counting the pixels in an image
43
Encoding and decoding a small colour image
44
Vector images
45
Comparing raster and vector images
46
Analogue sound waves and digital sound
47
Reading a sound waveform
48
How sound is turned into binary
49
A sample is one volume measurement
50
A sound as a sequence of numbers
51
Sample rate and audio quality
52
Hertz and kilohertz
53
Sample resolution
54
Number of volume levels from sample resolution
55
Bit rate of digital audio
56
Zooming in to see samples in an audio editor
57
Choosing settings: quality versus file size
58
Text, images and sound all become integers, then binary
59
Explaining data representation to a peer
Smaller journeys, one per content description
The same modules, split up so a class can take just the content description it's working on.
13
ACARA 7-8 Digital Technologies: Numbers and binary foundations — AC9TDI8K03, AC9TDI8K04
Students learn that digital systems store everything as numbers, why hardware uses two states, and how to count, read, write and size whole numbers in binary.
10
ACARA 7-8 Digital Technologies: Representing text — AC9TDI8K03, AC9TDI8K04
Students learn how characters are stored as number codes using character sets such as ASCII and Unicode, and how to encode and decode words in binary.
22
ACARA 7-8 Digital Technologies: Representing images — AC9TDI8K03, AC9TDI8K04
Students learn how images are stored as pixels with colour values, from black-and-white grids to RGB colour, colour depth, resolution and raster versus vector images.
14
ACARA 7-8 Digital Technologies: Representing sound and pulling it together — AC9TDI8K03, AC9TDI8K04
Students learn how sound is sampled and stored as binary numbers, weigh quality against file size, and explain how text, images and sound all become integers and then binary.
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:
✎
Issues in Technology Crossword: Is AI using too much power? and more (Part 1 of 2)
10 clues · Is AI using too much power?, How does an AI actually work?, Compression - losing quality or saving space?, Why file size matters and more
🔎
Issues in Technology Word Search: Is AI using too much power? to What is RADCAB? (All modules)
22 words to find · Is AI using too much power?, How does an AI actually work?, Compression - losing quality or saving space?, Why file size matters and more
✎
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 Crossword: Data, information and binary representation and Acquiring and manipulating data (Modules 11–20)
10 clues · Representing images with pixels, Primary and secondary data sources, Collecting data with a survey, Spreadsheet rows, columns and cells and more
🔎
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
✎
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
🔎
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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IGCSE Computer Science Paper 1 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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IGCSE Computer Science Paper 1 Crossword: 1.2 Text, Sound and Images and 1.3 Data Storage and Compression (Modules 43–58)
10 clues · Comparing ASCII and Unicode, Analogue sound waves and digital sound, Sample resolution, Effect of sample rate and resolution on accuracy and file size and more
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IGCSE Computer Science Paper 1 Crossword: 1.3 Data Storage and Compression (Modules 69–84)
10 clues · Converting to a smaller unit, Converting across several units, Giving the answer in the unit asked, Counting the pixels in an image and more
🔎
IGCSE Computer Science Paper 1 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
🔎
IGCSE Computer Science Paper 1 Word Search: 1.3 Data Storage and Compression (Modules 59–84)
20 words to find · Kibibyte (KiB), Mebibyte (MiB), Gibibyte (GiB), Tebibyte (TiB) and more
✎
ACARA Digital Technologies Years 5–6 Crossword: Networks and Sharing Data and Representing Data with Numbers (Modules 44–57)
10 clues · Describing a network in short sentences, Binary means two states, On and off switches in everyday things, Encode and decode and more
✎
ACARA Digital Technologies Years 5–6 Crossword: Representing Data with Numbers (Modules 59–71)
10 clues · Decoding run-length counts back into pixels, Why run-length encoding saves space, One bit gives two colours, Two bits give four shades: greyscale and more
🔎
ACARA Digital Technologies Years 5–6 Word Search: Networks and Sharing Data and Representing Data with Numbers (Modules 44–71)
20 words to find · Describing a network in short sentences, Binary means two states, On and off switches in everyday things, Encode and decode and more
✎
Crossword: Wired and Wireless Networks and Representing Text, Images and Sound (Modules 69–124)
10 clues · Wired vs wireless: mobility and convenience, Choosing a network type for a scenario, TCP/IP: the internet's core protocols, Redundant routes keep a network working and more
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Crossword: Representing Text, Images and Sound (Modules 128–152)
8 clues · Converting numbers from 0 to 127 using seven place values, Padding binary with leading zeros, ASCII codes for digits, spaces and punctuation, Converting a word to ASCII decimal codes and more
✎
Crossword: Representing Text, Images and Sound (Modules 153–172)
10 clues · Inspecting a pixel's RGB numbers, 24-bit colour: three bytes per pixel, Writing an RGB colour in binary, Vector images and more
✎
Crossword: Representing Text, Images and Sound and Binary Number Representation (Modules 173–188)
10 clues · Zooming in to see samples in an audio editor, Text, images and sound all become integers, then binary, Explaining data representation to a peer, The two-state (on/off) system and more
🔎
Word Search: Wired and Wireless Networks and Representing Text, Images and Sound (Modules 69–152)
21 words to find · Wired vs wireless: mobility and convenience, Choosing a network type for a scenario, TCP/IP: the internet's core protocols, Redundant routes keep a network working and more
🔎
Word Search: Representing Text, Images and Sound and Binary Number Representation (Modules 153–188)
20 words to find · Inspecting a pixel's RGB numbers, 24-bit colour: three bytes per pixel, Writing an RGB colour in binary, Vector images 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 ACARA Digital Technologies Years 7–8 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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