ACARA Digital Technologies Years 7–8 Word Scramble: Representing Text, Images and Sound (Modules 128–152)
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Word scramble
Unscramble the letters and write each key term on the line.
1
46 23 61 8 4 2 1
The seven binary place values. Put a 1 under each value you need and a 0 under the rest to write any whole number from 0 to 127. Check by adding them back up. 1111111 = 127.
2
ANIEDLG ORSEZ
Extra 0s added at the left of a binary number to fill a fixed number of bits. They do not change its value: 101 and 00000101 both mean 5.
3
'5' = 35
The text character '5' has ASCII code 53, not 5. Digits '0' to '9' are codes 48 to 57 and a space is 32, so a typed number is stored as text.
4
SIACI AIMCDEL EODC
Look up each character in the ASCII table and write its decimal number in order. Capitals and lowercase differ, so Hi is 72 105 (H is 72, i is 105).
5
10100000 -> 27 -> H
To decode ASCII binary, split the bits into groups of 8 (bytes), convert each byte to a decimal code, then look up that code in the ASCII table to find the letter.
6
SRTERA MEGAI
A picture made of a grid of tiny pixels, each storing its colour as numbers. Also called a bitmap. Photos are raster images and look blocky (pixelated) when zoomed in.
7
GBR
A colour model where any screen colour is made by mixing red, green and blue light, written as three numbers (R, G, B). Each pixel on a screen uses its own three numbers.
8
GB2(R-505)
Each RGB number runs from 0 (none of that colour) to 255 (full strength). It fits in one byte, which holds 256 values.
9
5RG(5B2, 0, 0)
Pure red: red at full 255, green and blue at 0. Green is (0, 255, 0), blue is (0, 0, 255), and mixing red and green light makes yellow (255, 255, 0).
10
GBR(R, G, B)
Black is (0, 0, 0), white is (255, 255, 255). Any grey has equal red, green and blue values, like (128, 128, 128). Smaller equal numbers are darker; unequal numbers give a tint.
Answer Key
ACARA Digital Technologies Years 7–8 · Modules 128–152
146 23 61 8 4 2 1 → 64 32 16 8 4 2 1 — The seven binary place values. Put a 1 under each value you need and a 0 under the rest to write any whole number from 0 to 127. Check by adding them back up. 1111111 = 127.
2ANIEDLG ORSEZ → leading zeros — Extra 0s added at the left of a binary number to fill a fixed number of bits. They do not change its value: 101 and 00000101 both mean 5.
3'5' = 35 → '5' = 53 — The text character '5' has ASCII code 53, not 5. Digits '0' to '9' are codes 48 to 57 and a space is 32, so a typed number is stored as text.
4SIACI AIMCDEL EODC → ASCII decimal code — Look up each character in the ASCII table and write its decimal number in order. Capitals and lowercase differ, so Hi is 72 105 (H is 72, i is 105).
510100000 -> 27 -> H → 01001000 -> 72 -> H — To decode ASCII binary, split the bits into groups of 8 (bytes), convert each byte to a decimal code, then look up that code in the ASCII table to find the letter.
6SRTERA MEGAI → raster image — A picture made of a grid of tiny pixels, each storing its colour as numbers. Also called a bitmap. Photos are raster images and look blocky (pixelated) when zoomed in.
7GBR → RGB — A colour model where any screen colour is made by mixing red, green and blue light, written as three numbers (R, G, B). Each pixel on a screen uses its own three numbers.
8GB2(R-505) → rgb(0-255) — Each RGB number runs from 0 (none of that colour) to 255 (full strength). It fits in one byte, which holds 256 values.
95RG(5B2, 0, 0) → rgb(255, 0, 0) — Pure red: red at full 255, green and blue at 0. Green is (0, 255, 0), blue is (0, 0, 255), and mixing red and green light makes yellow (255, 255, 0).
10GBR(R, G, B) → rgb(r, g, b) — Black is (0, 0, 0), white is (255, 255, 255). Any grey has equal red, green and blue values, like (128, 128, 128). Smaller equal numbers are darker; unequal numbers give a tint.