The common difference (d) in an arithmetic sequence is the constant value added to each term to get the next term. To find it, subtract any term from the term that follows it. Method: d = (second term) - (first term). Calculation: d = 8 - 5 = 3. Verification: Check with other consecutive terms: 11 - 8 = 3 ✓, 14 - 11 = 3 ✓. The common difference is 3, meaning each term is 3 more than the previous term. In ECZ examinations, identifying the common difference is often the first step in solving arithmetic sequence problems. This concept appears regularly in Paper 1 and Paper 2, sometimes in pure mathematics form and sometimes in real-world contexts like salary increments, savings patterns, or measurement sequences. Understanding common difference is fundamental to all arithmetic sequence calculations.

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Zambia

• Joseph Soko – 101 pts

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