NotesMath · P6Basic Algebra
Basic Algebra & Patterns Quick Notes
Primary-level algebra: replace unknown numbers with letters, form simple expressions, and evaluate — no equation solving beyond the PSLE syllabus.
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1
Write the Expression
3n means 3 × n. n + 5 means 'a number plus 5'.
2
Substitute
If n = 4, then 3n + 2 = 3 × 4 + 2 = 14.
3
Simplify
Combine like terms: 3n + 2n = 5n. 4n − n = 3n.
⚠️ Common Mistakes
Don't fall into these traps
- ✕Adding unlike terms (2n + 3 ≠ 5n)
- ✕Forgetting the coefficient
- ✕Confusing 2n with n²
Teacher Hidayah's Tip
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Substitute a small number like n = 2 to check your simplification.
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Sample Question
Try it, then read the worked solution
Question
Simplify 4n + 3 + 2n − 1.
Worked Solution
- 1Combine n terms: 4n + 2n = 6n
- 2Combine numbers: 3 − 1 = 2
- 3Answer: 6n + 2
Everything for Basic Algebra
Each topic in the library comes with the full 5-piece bundle.
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Before-Class Prep
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After-Class Practice
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Downloadable Notes
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One-Page Mind Map
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Mistake Fix Zone