ACARA Digital Technologies Years 5–6 Definitions Worksheet: Networks and Sharing Data and Representing Data with Numbers (Modules 44–57)
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Key terms
Write what each term means, in your own words.
1
network description
2
binary
3
0 = off, 1 = on
4
encode / decode
5
A = 0, B = 1
6
row by row
7
1 = black, 0 = white
8
decode
9
decode to check
10
pattern
Answer Key
ACARA Digital Technologies Years 5–6 · Modules 44–57 · Student wording will vary for definitions
1network description — A few short sentences that name the devices in a network, say how they connect, and say what the network lets people do, such as share files or a printer.
2binary — Using only two values, like 0 and 1 or on and off. Computers store all data using just these two states.
30 = off, 1 = on — A switch has two states. We write 0 for off and 1 for on, so a row of switches or LEDs can be written as binary digits, like 1 0 1 1.
4encode / decode — To encode is to turn information into a code. To decode is to turn the code back into the information, using a key. They are opposites.
5A = 0, B = 1 — A key that lets two different symbols, like A and B, stand for the binary values 0 and 1. Any two symbols work if each one always keeps the same meaning.
6row by row — Read a pixel grid in order: start at the top row, go left to right across it, then move down to the next row until the grid ends.
71 = black, 0 = white — To encode a black-and-white picture, write 1 for each black pixel and 0 for each white pixel. Work row by row, one bit per pixel.
8decode — To turn a code back into a picture: fill the grid row by row, colouring a square for each 1 and leaving it white for each 0. Then check the picture makes sense.
9decode to check — One wrong digit in an image code changes just one pixel. Decode the code back into a picture to spot the wrong pixel, then fix that digit.
10pattern — Something that repeats or mirrors in an image code, like matching rows, a symmetrical picture or a run of the same digit. You can spot it and describe it in words.