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Year 8 Computer Science Revision Guide

A visually engaging revision deck for 12–13-year-olds

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Year 8 Computer Science Revision Guide
Prepare for your exam with confidence
1 / 10
Year 8 Computer Science Revision Guide
Prepare for your exam with confidence
Year 8 Computer Science Revision Guide1 / 10
Decimal Numbers
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    Base-10 system uses digits 0–9
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    Each position is a power of 10 (e.g., 100s, 10s, 1s)
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    Example: 345 = 3×100 + 4×10 + 5×1
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    Place value increases left to right
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Binary Numbers
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    Base-2 system uses only 0 and 1
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    Each digit is a bit (binary digit)
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    Place values are powers of 2 (e.g., 8, 4, 2, 1)
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    Example: 1011 = 8 + 0 + 2 + 1 = 11
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Binary to Decimal Conversion
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    Write down binary place values
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    Add values where bits are 1
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    Example: 1101 = 8 + 4 + 0 + 1 = 13
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    Practice: Convert 1010 to decimal
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    Answer: 10
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    Try 1111 (Answer: 15)
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Hexadecimal
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    Base-16 system uses digits 0–9 and A–F
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    A=10, B=11, C=12, D=13, E=14, F=15
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    Used in computing for compact data
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    Example: 1A in hex = 26 in decimal
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Binary and Hexadecimal
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    4 binary bits = 1 hex digit
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    Example: 1101 (binary) = D (hex)
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    Easier to read and write than long binary
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    Convert 1010 to hex (Answer: A)
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    Convert 1111 to hex (Answer: F)
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    Convert B to binary (Answer: 1011)
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Digital Images
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    Images are stored as data in computers
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    Made up of tiny dots called pixels
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    Resolution = number of pixels (e.g., 1920×1080)
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    Higher resolution = sharper image
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Pixels
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Zoomed-in image showing individual pixels as colored squares
Zoomed-in image showing individual pixels as colored squares
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    Pixels are the smallest unit of an image
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    Each pixel has a color value
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    Millions of pixels make up a photo
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RGB Colour Model
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    Red, Green, Blue are primary colors of light
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    Mixing RGB creates all colors on screens
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    Each color has a value 0–255
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    Example: (255, 0, 0) = pure red
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Image File Types
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    JPEG:
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