# Computing Theory

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What is binary?
Binary is a string of numerical values of base 2.
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What is '15' in binary?
1111.
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What is denary?
Denary is a string of numerical values of base 10.
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What is '11' in denary?
3
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Why do we count in denary?
Most people think that it is because we have 10 fingers and have therefore adopted the denary system.
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What is a bit?
A 1 or 0.
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What is a byte?
A byte is 8 bits.
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What is a nibble?
A nibble is 4 bits.
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What is a kilobyte?
1024 Bytes.
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What is a megabyte?
1000000 Bytes. (1 Million)
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What is a gigabyte?
1000000000 Bytes. (1 Billion)
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What is a terabyte?
1000000000000 Bytes. (1 Trillion)
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What is a petabyte?
1000000000000000 Bytes. (1 Thousand Million)
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What is an exabyte?
1000000000000000000 Bytes (1 Million Billion)
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What is 10011101 in denary?
157.
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What is 1011 in denary?
11.
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What is 110111 in denary?
55.
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What is 1011011 in denary?
91.
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What is 1111111 in denary?
127.
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What is 145 in binary?
10010001.
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What is 84 in binary?
1010100
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What is 100 in binary?
1100100
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What is 129 in binary?
10000001
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What is 499 in binary?
111110011
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In binary, colours can go from which number to which number?
00000000 to 11111111.
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Which colour is the strongest in this binary code?: 00000000 11110000 11111111
Blue.
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Which colour is the strongest in this binary code?: 11111100 00111111 01010101
Red.
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How many shades of red, green and blue are there for each colour?
256.
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What is hex short for?
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What base is hex?
16.
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What is ff in denary?
255.
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How would you make purple in hex?
ff00ff.
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What is 100011101110011101100001 in hex?
8ee761
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Write an algorithm to find the sum of all the multiples of 3 or 5 below 1000.
Use CS Cue Card 1 to find answer.
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## Other cards in this set

### Card 2

#### Front

What is '15' in binary?

1111.

What is denary?

### Card 4

#### Front

What is '11' in denary?

### Card 5

#### Front

Why do we count in denary?