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Tricks for Fast Calculations Video Lecture | Quantitative Aptitude (Quant) - CAT

181 videos|146 docs|111 tests

FAQs on Tricks for Fast Calculations Video Lecture - Quantitative Aptitude (Quant) - CAT

1. How can I quickly multiply two-digit numbers in my head?
Ans. One trick to quickly multiply two-digit numbers in your head is to break down the numbers into parts and then multiply. For example, to multiply 23 by 15, you can break down 23 into 20 and 3, and 15 into 10 and 5. Then, multiply 20 by 10 to get 200, 20 by 5 to get 100, 3 by 10 to get 30, and 3 by 5 to get 15. Finally, add all these results together to get the final answer of 345.
2. What is a shortcut for calculating percentages quickly?
Ans. To quickly calculate percentages, you can use the concept of finding 10% first and then adjusting accordingly. For example, to find 20% of a number, you can first find 10% by moving the decimal point one place to the left, and then multiply that by 2 to get 20%. This method can help you calculate percentages faster in your head.
3. How can I quickly divide numbers without using a calculator?
Ans. One trick for quickly dividing numbers is to use the concept of finding factors and canceling out common factors. For example, when dividing 48 by 6, you can cancel out the common factor of 6 to simplify the calculation to 8 divided by 1, which is 8. This method can help you divide numbers quickly without the need for a calculator.
4. Are there any shortcuts for adding long lists of numbers quickly?
Ans. One shortcut for adding long lists of numbers quickly is to group numbers that add up to multiples of 10. For example, when adding 37, 24, 56, and 13, you can group 37 and 13 together to get 50, and 24 and 56 together to get 80. Then, add 50 and 80 to get 130, which is the sum of the original list of numbers. This method can help you add long lists of numbers more efficiently.
5. How can I quickly calculate square roots in my head?
Ans. One trick for quickly calculating square roots in your head is to use the concept of approximating the square root to the nearest whole number. For example, to find the square root of 70, you can approximate it to the nearest whole number, which is 8. Then, you can adjust your answer based on whether the actual square root is closer to 8 or 9. This method can help you estimate square roots quickly without needing a calculator.
181 videos|146 docs|111 tests

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