Math Calculator Guides
Articles that explain formulas, edge cases, and interpretation for math calculators. Each guide links to the relevant tools so you can apply what you learn.
Jul 22, 2026
Percentage Jobs: % of, What %, and % Change
The same % symbol hides three jobs. Separate % of, what %, and % change, then decode percentage points vs relative change with a verified 40→45 twin and a compound +10% trap.
Jul 22, 2026
2×2 Matrix Ops: Shape Gate, Multiply Peel, and Why Order Matters
Check dimensions before you add or multiply. Walk the same 2×2 pair through element-wise add and row·column multiply, peel each product cell, and see why AB is usually not BA.
Jul 22, 2026
Quadratic Roots: Discriminant Gate, Formula Peel, and Vieta Check
Read D = b² − 4ac before you trust the ± formula. Gate two-real, repeated, and complex cases, peel the work steps, then verify with vertex and Vieta. Educational algebra literacy, not a CAS.