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Tips to solve numerical aptitude questions
Guys, can you give me some good Tips to solve numerical aptitude questions???? Every placement test on quantitative aptitude will contain at least 30% questions on number systems and number series. You can score easily on quantitative aptitude section if you understand the basics of number system. Practicing problems on numbers systems like HCF and LCM, averages, percentages, time and speed, pipes and cisterns etc as well. Formulas of Number Series 1 + 2 + 3 + 4 + 5 + … + n = n(n + 1)/2 (12 + 22 + 32 + ..... + n2) = n ( n + 1 ) (2n + 1) / 6 (13 + 23 + 33 + ..... + n3) = (n(n + 1)/ 2)2 Sum of first n odd numbers = n2 Sum of first n even numbers = n (n + 1) Mathematical Formulas (a + b)(a - b) = (a2 - b2) (a + b)2 = (a2 + b2 + 2ab) (a - b)2 = (a2 + b2 - 2ab) (a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca) (a3 + b3) = (a + b)(a2 - ab + b2) (a3 - b3) = (a - b)(a2 + ab + b2) (a3 + b3 + c3 - 3abc) = (a + b + c)(a2 + b2 + c2 - ab - bc - ac) When a + b + c = 0, then a3 + b3 + c3 = 3abc (a + b)n = an + (nC1)an-1b + (nC2)an-2b2 + … + (nCn-1)abn-1 + bn Shortcuts for number divisibility check A number is divisible by 2, if its unit's digit is any of 0, 2, 4, 6, 8. A number is divisible by 3, if the sum of its digits is divisible by 3. A number is divisible by 4, if the number formed by the last two digits is divisible by 4. A number is divisible by 5, if its unit's digit is either 0 or 5. A number is divisible by 6, if it is divisible by both 2 and 3. A number is divisible by 8, if the number formed by the last three digits of the given number is divisible by 8. A number is divisible by 9, if the sum of its digits is divisible by 9. A number is divisible by 10, if it ends with 0. A number is divisible by 11, if the difference of the sum of its digits at odd places and the sum of its digits at even places, is either 0 or a number divisible by 11. A number is divisible by 12, if it is divisible by both 4 and 3. A number is divisible by 14, if it is divisible by 2 as well as 7. Two numbers are said to be co-primes if their H.C.F. is 1. To find if a number, say y is divisible by x, find m and n such that m * n = x and m and n are co-prime numbers. If y is divisible by both m and n then it is divisible by x. Last edited by Aakashd; February 18th, 2020 at 04:37 PM. |
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Re: Tips to solve numerical aptitude questions
A Quantitative Aptitude test tests you on the numerical ability and accuracy level in the mathematical calculations. To prepare well for quantitative aptitude you should know well about the types of questions that are covered under this which can be done by a little bit of research and by taking up the questions of this section. Get the right study material Remove the fear within you Do not lose hope Spend one quality hour everyday Do not mug ever Solve all the example questions Fresh mind before preparation and during the last minutes in exam Try to solve previous year question papers………
__________________ Answered By StudyChaCha Member |
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