Common Difference

The common difference $d$ is the fixed amount added between consecutive terms of an arithmetic progression, found by $d=T_n-T_{n-1}$. A positive $d$ makes the sequence increase, a negative $d$ makes it decrease.

It stays the same between every pair of neighbouring terms.

You meet Common Difference in the Progressions chapter of SPM Additional Mathematics. Knowing the term precisely matters in the exam: questions often hinge on reading a keyword correctly, and because SPM marking is analytic, using the right definition in your working helps secure method marks.

Our teachers make sure a student can not only recite what Common Difference means but use it fluently in a full solution.

Because the SPM Add Math paper is bilingual (BM/EN), it helps to know this term in each language: Common Difference (EN) · Beza Sepunya (BM) · 公差 (中文)

Other key terms from the Progressions chapter you may want to check:

• Sequence
• Arithmetic Progression
• Geometric Progression
• Common Ratio
• nth Term
• Sum of the First n Terms