Time-Saving Shortcuts for the Arithmetic Section of Bank Exams

Bank examinations reward accuracy, but they punish hesitation. In the quantitative aptitude section, candidates are typically given under a minute per question, and the arithmetic portion—percentages, ratios, averages, simple and compound interest—accounts for the bulk of that pressure. For students in Sydney, Melbourne or Perth who are preparing alongside full-time work or university commitments, the arithmetic grind can feel like running through Brisbane's hilly streets with a heavy backpack. The good news is that a handful of dependable mental maths shortcuts can reclaim thirty to forty minutes across a full mock test, and that margin often separates a qualifying score from a rejection letter.

The approach laid out below has been used by candidates from Tier-2 Indian cities as well as by aspirants sitting the same syllabus from Adelaide and Canberra. Each technique is paired with a worked example, the kind you will see in SBI PO, IBPS Clerk and SSC CGL papers. Where relevant, links to broader exam preparation resources are provided so you can drill deeper once the core method is clear.

Percentages and fraction conversions that cut calculation time

Percentages appear in roughly half of all arithmetic questions, whether they are wrapped inside a profit-and-loss sum, a population growth problem or a discount offer on a Commonwealth Bank fixed deposit rate. The first habit worth building is treating every common percentage as a clean fraction: 12.5% is one-eighth, 16.67% is one-sixth, 37.5% is three-eighths, and 87.5% is seven-eighths. When you spot a fraction-style percentage inside a question, the multiplication collapses into a single division, which is far less error-prone on a screen or an OMR sheet.

The second habit is the successive percentage formula. If a price rises by 20% and then falls by 10%, students often add the numbers and write down 10% as the net change, which is wrong. The correct formula multiplies the new and old values: 1.20 multiplied by 0.90 equals 1.08, meaning a net 8% rise. Practise this with Australian figures—convert AUD 50,000 by 8% in your head and you have the answer in eight seconds, no calculator required. For students travelling between Parramatta and the city for classes, these seconds add up to an extra question solved per slot.

Squaring, cubing and finding roots in seconds

Squares of two-digit numbers come up repeatedly in simplification and number series questions. A reliable trick is to memorise squares from 11 to 50, then use the identity (a+b)² = a² + 2ab + b² for anything larger. For instance, 67² is 60² + 2×60×7 + 7² = 3600 + 840 + 49 = 4489. Once the squares are second nature, square roots of perfect squares up to 2500 can be read off in a glance, which speeds up simplification questions dramatically.

Cubes are less frequent but equally important for cubes-and-roots questions. A practical memory aid is to learn cubes of 1 to 15 along with their last digit patterns. The cube of 14, for example, is 2744, and recognising that 14² is 196 and 14³ is 2744 lets you move through the question without a pause. Many aspirants living around Melbourne's Docklands report that reciting these tables during a tram commute is more productive than scrolling social feeds, and the retention is noticeably stronger.

Simplification through approximation and BODMAS mastery

BODMAS is taught early, yet candidates still lose marks because they apply operations in the wrong order under time pressure. A useful rule of thumb: always resolve the deepest bracket first, then the next, then handle multiplication and division from left to right. The "left to right" rule is the one most often forgotten, especially when the expression reads as 60 ÷ 6 × 5. The correct answer is 50, not 2, because you divide before you multiply when reading left to right.

Approximation is the second pillar of fast simplification. When the answer choices are spread apart—say, 142, 218, 309 and 401—rounding intermediate values to one significant figure gives you the right option almost every time. Try 999 × 1.01 by treating 1.01 as roughly 1, getting 999, then picking the closest option. The trick fails only when choices are tightly clustered, which is when precision matters. Train this judgement by timing yourself on a daily set, the kind included in structured exam preparation modules.

Speed strategies for data interpretation sets

Data interpretation consumes a disproportionate amount of time because candidates read every label and tick before touching the calculator. A faster method is to scan the questions first, then go back to the chart or table and extract only the numbers that matter. This is exactly how analysts at the Reserve Bank of Australia read quarterly bulletins—bottom-line first, supporting figures on demand.

Percentage change recognition is another time saver. If a value moves from 240 to 300, the change is 25%, because 60 is one-quarter of 240. Memorise the reciprocal pairs—8.33% is one-twelfth, 14.28% is one-seventh, 16.67% is one-sixth—and many DI questions reduce to one step. Line graphs on topics like Australian housing approvals or Indian bank branch expansion often show changes that align with these familiar fractions, so practising with a mix of datasets keeps the recognition sharp across the syllabus.

Ratio, proportion and partnership techniques

Ratios are the skeleton of mixture, partnership and age problems. A method that works for almost every ratio question is to keep the ratio in its smallest integer form and then scale using a single multiplier. For a 3:5 ratio with a total of 96, the multiplier is 12, giving 36 and 60. Avoid the temptation to convert to decimals mid-calculation; integers stay cleaner in your working memory and reduce transcription errors on the answer sheet.

Alligation is the elegant cousin of ratios and is essential for mixture problems. The cross-multiplication method—(price of dearer mixture minus mean price) to (mean price minus price of cheaper mixture)—gives the ratio of the two ingredients in a single line. A student preparing in Brisbane can apply this to a question about blending two grades of coffee beans just as easily as to a milk-and-water mixture, because the underlying algebra is identical. Practising with everyday quantities makes the formula feel intuitive rather than mechanical.

Time, work, pipes and distance formulae

The classic "A can do a work in 10 days, B in 15 days" question is solved by taking the LCM of the days and treating the LCM as the total work. A's one-day work is then 6 units if the LCM is 30, and B's is 2 units, giving a combined rate of 8 units per day. This LCM technique is faster than fractions and avoids the messy denominators that slow down most beginners. The same method extends to pipes-and-cisterns, where the negative rate of a draining pipe is simply subtracted.

For trains, boats and streams questions, relative speed is the concept to internalise. A train moving at 60 km/h and another at 40 km/h in the same direction close the gap at 20 km/h, not 100 km/h. Boats travelling upstream lose speed equal to the stream's flow, while downstream they gain it. Drawing a one-line diagram on the rough sheet—a horizontal line with two arrows for trains, or a boat with a small arrow for current—locks the direction in your mind and prevents the classic sign error. When aspirants review these diagrams against sample papers, they typically halve the time spent on the question within a week.

A final piece of practical advice: shortcuts only save time when they have been drilled to the point of reflex. Set aside twenty minutes each evening to practise a fixed number of questions using one technique, log the accuracy, and revisit the frequently asked questions page whenever a concept refuses to settle. Within a month, the arithmetic section will feel less like a hurdle and more like a scoring opportunity, and the cumulative effect on the overall bank exam rank can be substantial.