The Three Arithmetic Traps That Quietly Cost Students Marks in JNVST and AISSEE

Arithmetic Marks Get Lost Before the Calculation Even Starts

When I go through wrong answers in our own practice papers, the pattern isn't "the student didn't know how to calculate profit and loss" or "didn't know HCF." It's that the question was read too fast, and a specific word did the damage before a single number was even worked out. These three traps show up in JNVST and AISSEE Arithmetic sections every single year.

Trap One: "Cost Price" vs. "Selling Price" Swapped in the Question

Profit and loss questions almost always give you two of cost price, selling price, and profit/loss percentage, and ask for the third. The trap is a question that states the numbers in a different order than students expect — "a shopkeeper sells an item for ₹450 at a loss of 10%, find the cost price" reads very differently from "buys for ₹450." A student who's memorized the formula but not the definitions plugs the wrong number into the wrong slot and gets a confident, wrong answer.

How to avoid it: before calculating anything, write CP = ___ and SP = ___ on your rough sheet and fill them in from the question text, one at a time. Never solve profit-loss questions from memory of "the number that comes first."

Trap Two: Units That Quietly Change Mid-Question

Speed, distance, and time questions frequently mix km/h with meters, or hours with minutes, inside the same question. A student who calculates correctly in the wrong unit gets an answer that "looks reasonable" and moves on — which is exactly why this trap works. Always convert everything to one consistent unit in the first line of your working, before touching the actual formula.

Trap Three: "Simple" Questions That Are Actually Testing Order of Operations

A number series or a fractions question with mixed operations (addition, multiplication, brackets) is often less about the concept and more about whether a student applies BODMAS correctly under time pressure. Rushed students frequently calculate left to right instead of respecting brackets and multiplication first — and the wrong-answer options are built to match exactly that mistake, so it feels "confirmed" rather than caught.

A Simple Habit That Fixes All Three

Read every arithmetic question twice before writing anything. The first read is to understand what's actually being asked; the second is to note down what's given, in the units the question actually uses. This costs perhaps fifteen extra seconds and eliminates a category of mistake that has nothing to do with how good a student's arithmetic actually is.

Practicing This the Right Way

Solving speed drills helps with calculation speed, but it doesn't fix trap-reading. For that, timed past-paper sections followed by a slow, careful review of exactly why each wrong option was wrong — not just what the right answer was — teaches the pattern-recognition that actually prevents these mistakes on exam day.