Material Detail

Three printable worksheets for a first unit on number systems in computer science. Each PDF has the worksheet on page 1 and a full answer key on page 2.

Binary to decimal: place values with a worked example, 10 conversions each way, padding numbers to 8 bits, counting from 8 to 15 in 4 bits, and two reasoning questions.

Secret messages in binary: an A to Z table of 8-bit ASCII codes, three messages to decode, four to encode, and a name-swap activity for pairs.

Hexadecimal: hex digits as 4 bits, hex to decimal and back, hex to binary, and splitting web color codes into red, green and blue.

The page also links free online converters students can use to check their answers. Free to print and copy for classroom use.

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