Leaving Cert Maths
8 guides on the parts of Leaving Cert Maths students reliably get wrong - the definitions that blur together, the steps that get skipped, and the reasoning an examiner expects to see. Each one names the mistake, explains why it happens, and gives you the correction.
Common errors when solving quadratic equations
Factorising when the equation does not factorise, and losing a root by dividing through by x. Quadratic errors in Leaving Cert Maths.
Common Mistakes in Function Notation That Cost Marks
f of x is an instruction, not a multiplication. The function notation errors that quietly cost marks in Leaving Cert Maths.
How to stop making silly mistakes in Calculus differentiation
Chain rule inside product rule is where most marks go. Differentiation slips in Leaving Cert Maths, and the checks that catch them.
How to truly master complex Trigonometric identities
Work on one side only, and convert everything to sin and cos before doing anything clever. Proving trigonometric identities in Leaving Cert Maths.
Why Students Struggle With Set Notation
Union, intersection and complement in the wrong order give the wrong region. Set notation and Venn diagrams for Leaving Cert Maths.
The most frequent mistakes in limits and continuity
Substituting first and thinking zero over zero means no limit. What to do instead when a limit does not evaluate directly.
The top 5 most common errors in Probability and Statistics
Adding probabilities that should be multiplied, and treating dependent events as independent. Probability errors in Leaving Cert Maths.
Why students struggle with Permutations and Combinations
Whether order matters decides which formula you need, and deciding that is the whole question. Counting problems in Leaving Cert Maths.