Complete OCR GCSE Computer Science J277 1.2 unit: 10 lessons, work and homework booklets, 4 assessments with mark schemes, and full answers.

Everything you need to teach the whole of OCR J277 1.2: primary storage, secondary storage, units, data storage and compression. Every answer has been checked, and every calculation is worked through.

10 lessons (228 editable PowerPoint slides)

1. Number Systems (binary, denary and hexadecimal)
2. Binary Arithmetic (addition, overflow and binary shifts)
3. Character Encoding (ASCII, Unicode and text file sizes)
4. Data Capacity (units from bits to petabytes, and storage calculations)
5. Images (pixels, colour depth, resolution and metadata)
6. Sound (sample rate, bit depth and duration)
7. Compression (lossy and lossless)
8. Primary Storage (RAM, ROM and virtual memory)
9. Secondary Storage Types (magnetic, solid state and optical)
10. Storage Comparisons (capacity, speed, portability, durability, reliability and cost)

Every lesson includes

• Learning objectives and a retrieval Do Now with answers
• Clear teaching slides with diagrams, worked examples and tables
• Independent practice with answer slides
• OCR-style exam questions with a mark scheme
• A Success Check quiz with answers and a reflective plenary
• Teacher notes on every slide

Work booklets (with answers)

• Data Representation work booklet (28 pages)
• Memory and Storage work booklet (16 pages)
  Students follow along in lessons with varied activities: conversions, fill the gaps, matching, true or false, spot the mistake, ordering steps, scenario tables, “weak to strong” answer practice and exam questions.

Homework booklets (with answers)

• Data Representation homework booklet (20 pages)
• Memory and Storage homework booklet (12 pages)

Assessments (Word, with mark schemes)

• Mid-Unit Assessment 1: Data Representation (42 marks)
• Mid-Unit Assessment 2: Memory (27 marks)
• Mid-Unit Assessment 3: Storage (30 marks, including a 6-mark extended answer)
• End of Unit Assessment (60 marks, including an 8-mark extended answer)
  Mark schemes include levels-of-response guidance and accept answers using 1,024.

Also included

• Data Representation challenge booklet: 70 questions with worked solutions
• Knowledge check and quick quiz, with answers
• Pixel art pack: worksheet, answers and Python turtle scripts

What’s included: 10 PowerPoint lessons, 4 booklets (each with an answer copy), 4 assessments with mark schemes, a challenge booklet with solutions, 2 quizzes with answers and the pixel art pack.

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