Free Grade 8 Computer Science Worksheets with Answers

Grade 8 Binary Numbers

2-DA-07

Converting between binary and decimal with place values 1, 2, 4, 8 … and adding binary numbers.

e.g. What is the binary number 10001110 in decimal?

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Grade 8 Hexadecimal

2-DA-07

Converting between hexadecimal, decimal and binary, and reading hex colour codes.

e.g. Convert the hexadecimal number 82 to 8-bit binary.

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Grade 8 Spreadsheet Formulas

2-DA-08

Working out what spreadsheet formulas like =SUM, =AVERAGE, =MAX and =B2*C2 will show.

e.g. In the spreadsheet (A1=5, B1=10, C1=10; A2=9, B2=26, C2=14; A3=13, B3=15, C3=6; A4=3, B4=4, C4=16), what does the formula =MAX(A1:A4) show?

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Grade 8 Variables & Data Types

2-AP-11

Recognising integers, floats, strings and Booleans, and how operators behave on each.

e.g. What data type is the value True: integer, float, string, or Boolean?

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Grade 8 Tracing Code (Python)

2-AP-12

Reading short Python programs with variables, if/else and loops and working out what they print.

e.g. x = 4. if x > 20: print("big") elif x == 20: print("equal") else: print("small"). What is printed?

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Grade 8 Lists & Arrays

2-AP-11

Indexing, slicing and changing lists, and finding their length and values.

e.g. nums = [3, 10, 25, 26, 48, 46]. What is nums[4]? (Indexes start at 0.)

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Grade 8 Searching & Sorting

2-AP-10

Counting the steps in linear and binary search and tracing bubble and selection sort passes.

e.g. Binary search on the sorted list 7, 8, 13, 20, 23, 24, 27, 34, 35. Which number is checked first (the middle item)?

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Grade 8 Flowcharts

2-AP-10

Following flowcharts with decisions and loops to find the output for a given input.

e.g. Flowchart: input x = 10. Is x > 9? If yes, output x − 3. If no, output x × 4. What is output?

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Grade 8 Logic Gates

Working out the outputs of AND, OR, NOT and XOR gates and small logic circuits.

e.g. A OR gate has inputs A = 1 and B = 1. What is the output?

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Grade 8 Boolean Expressions

2-AP-12

Evaluating Boolean expressions with AND, OR and NOT, including comparisons.

e.g. What is the value of not (False and True) or True?

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Grade 8 Networks & the Internet

2-NI-04

How networks move data: devices, IP addresses, packets and download times.

e.g. Is 113.141.9.293 a valid IPv4 address (each part 0–255)? Answer yes or no.

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Grade 8 Cybersecurity & Passwords

2-NI-06

Password strength by counting combinations, spotting threats, and simple encryption.

e.g. A PIN has 5 digits (0–9). How many different PINs are possible?

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Grade 8 Functions & Return Values

Advanced

Tracing functions with parameters and return values, including functions that call other functions.

e.g. def f(x): return 3 * x + 4. What does print(f(f(1))) show?

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Grade 8 Computing Challenge Puzzles

Challenge

Puzzles that stretch computational thinking: bit patterns, logic and clever counting.

e.g. How many different patterns can 3 bits make?

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