ACARA Digital Technologies Years 5–6 Crossword: Representing Data with Numbers (Modules 59–71)
Name:
Date:
Class:
✎
Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
1
2
3
4
5
6
7
8
9
Across
- 2. To ______ a grid of numbers, look up each number in the colour key, then colour that square the matching colour. Doing this for every square rebuilds the picture. (6)
- 3. One bit per pixel can only be 0 or 1, so each pixel can only be one of two ______, like black and white. A photo needs many more ______, so it needs more bits. Word 4 of: 1 bit = 2 _______ (7)
- 6. Counts each run of one colour instead of listing every pixel. It saves space on long runs, like an all-white row, but saves little when colours change every pixel, like a checkerboard. Word 3 of: ___-______ ________ (8)
- 8. Word 1 of the term in 2 Down: ___-______ ________ (3)
- 9. Word 4 of the term in 1 Down: ______ _____ = ___ ______ (6)
Down
- 1. Set the ______ ______ and ______ ______ to the same size so each cell is a square. A block of square cells then looks like a pixel grid. Word 1 of: ______ _____ = ___ ______ (6)
- 2. Turn counts back into pixels: write that many of one colour, then that many of the other, taking turns, until the row is full. Start with white. A first count of 0 means the row starts black. Word 3 of: ___-______ ________ (8)
- 4. Word 2 of the term in 2 Down: ___-______ ________ (6)
- 5. Word 3 of the term in 1 Down: ______ _____ = ___ ______ (3)
- 7. Word 2 of the term in 1 Down: ______ _____ = ___ ______ (5)
Answer Key
ACARA Digital Technologies Years 5–6 · Modules 59–71
1C
O
2D
E
C
O
D
E
L
E
U
3C
O
4L
O
U
5R
S
M
O
E
O
6E
N
C
O
D
I
N
G
W
7W
I
G
I
8R
U
N
T
D
G
9H
E
I
G
H
T
H
Across
2DECODE — To ______ a grid of numbers, look up each number in the colour key, then colour that square the matching colour. Doing this for every square rebuilds the picture.
3COLOURS — One bit per pixel can only be 0 or 1, so each pixel can only be one of two ______, like black and white. A photo needs many more ______, so it needs more bits. Word 4 of: 1 bit = 2 _______
6ENCODING — Counts each run of one colour instead of listing every pixel. It saves space on long runs, like an all-white row, but saves little when colours change every pixel, like a checkerboard. Word 3 of: ___-______ ________
8RUN — Word 1 of the term in 2 Down: ___-______ ________
9HEIGHT — Word 4 of the term in 1 Down: ______ _____ = ___ ______
Down
1COLUMN — Set the ______ ______ and ______ ______ to the same size so each cell is a square. A block of square cells then looks like a pixel grid. Word 1 of: ______ _____ = ___ ______
2DECODING — Turn counts back into pixels: write that many of one colour, then that many of the other, taking turns, until the row is full. Start with white. A first count of 0 means the row starts black. Word 3 of: ___-______ ________
4LENGTH — Word 2 of the term in 2 Down: ___-______ ________
5ROW — Word 3 of the term in 1 Down: ______ _____ = ___ ______
7WIDTH — Word 2 of the term in 1 Down: ______ _____ = ___ ______