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Quantitative Aptitude Section of a banking examination is all about calculations. If you are a dab hand at calculations, it will do the trick or else, you may have your chips in the examination. These competitive examinations are intended towards testing one’s ability to solve the maximum number of questions in the minimum time with high accuracy. Some people might wonder why there are people who can do the toughest of the calculations within seconds while others find it difficult to do the simplest of the calculations. It depends solely on the hard work and practice that one continues to work up to becoming excellent at calculations.
You can not resort to calculators in these competitive examinations and you are running so short of time that you cannot even break to pen and paper. In that case, one needs to be top-notch at doing calculations in her head so as to sail through the Quantitative Aptitude Section the exams. So, here is an article that discusses some tips and tricks to improve your calculation speed.
- Have all the multiplication tables up to 20, squares up to 30, cubes up to 20, and fraction tables (1/n) entirely grasped. It will definitely work like a charm when you are attempting the questions in the real examination, especially the ones on Simplification and Approximation.
- Take speed tests on a regular basis. This allows one to solve the questions on a similar pattern regularly and thus one will be able to solve them with poise when asked in the examination.
- Try to do most of the everyday calculations on your own like the ones you do at grocery stores or at the time of splitting bills at a party. Start to check the Cricket Scores that are quite big in number, and try performing Average, Subtraction, Multiplications on them. While traveling, you can also check car numbers and divide/multiply them by the number of cars you marked so far. It will give a boost to your calculation speed and do a good turn in future when you attempt a competitive exam.
- Continuous practice is always beneficial, as the candidate is able to find a pattern to some kinds of questions. This way, you develop some tips and tricks on your own to solve specific types of questions. This also helps one remember the answer to a particular calculation e.g. adding/subtracting/multiplying this number by 11 gives this.
- For almost every problem of Quant Section, there is a technique or trick given by Vedic Math that may help candidates saving their precious time during the examination. One must always know where a particular technique or trick is to be used while solving different questions.
Here are a few important things to remember that will help you perform fast calculations while attempting competitive examinations:
- 1/n Table:
| Fraction | Decimal | Percent |
|---|---|---|
| 1/2 | 0.5 | 50% |
| 1/3 | 0.333… | 33.333…% |
| 2/3 | 0.666… | 66.666…% |
| 1/4 | 0.25 | 25% |
| 3/4 | 0.75 | 75% |
| 1/5 | 0.2 | 20% |
| 2/5 | 0.4 | 40% |
| 3/5 | 0.6 | 60% |
| 4/5 | 0.8 | 80% |
| 1/6 | 0.1666… | 16.666…% |
| 5/6 | 0.8333… | 83.333…% |
| 1/8 | 0.125 | 12.5% |
| 3/8 | 0.375 | 37.5% |
| 5/8 | 0.625 | 62.5% |
| 7/8 | 0.875 | 87.5% |
| 1/9 | 0.111… | 11.111…% |
| 2/9 | 0.222… | 22.222…% |
| 4/9 | 0.444… | 44.444…% |
- Multiplying a three-digit number by a three-digit number
Step 1: CF (Write only the unit’s digit and carry the rest to the next step).
Step 2: BF + CE + Carried Over (Write only the unit’s digit and carry the rest to the next step).
Step 3: AF + CD + BE + Carried Over (Write only the unit’s digit and carry the rest to the next step).
Step 4: AE + BD + Carried Over (Write only the unit’s digit and carry the rest to the next step).
Step 5: AD + Carried Over (Write the complete number because this is the last step).
E.g.
- Multiplying a two-digit-number by a two-digit-number
- Square of numbers ending in 5
75 × 75 or 75²
We simply multiply 7 by the next number i.e. 8 to get 56 which forms the first part of the answer and the last part is simply 25 = (5)².
So, 75 × 75 = 5625
This method is applicable to numbers of any size.
Example: 605²
60 × 61 = 3660 and 5² = 25
∴ 605² = 366025
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