4 simple tricks to solve quantitative aptitude questions https://www.qriyo.com/blog/tricks-solve-quantitative-aptitude-questions/
• All the students have had their fair share of mathematics in school and college, but when it comes to solving aptitude questions, they struggle. The main reason they struggle is a time constraint. A simple math question can be solved by everyone, but if you have 50 questions to solve in 60 minutes, then your speed should be really good. I am not talking about your problem-solving speed, I am talking about adopting some methods that reduce your calculations dramatically and enable you to arrive at the answer in a fraction of the time you were spending earlier. In other words, you need to analyze different ways to solve quantitative aptitude questions and use the fastest among them
Use the options given to solve • In a lot of quantitative aptitude questions, you can analyze the options given and easily eliminate the ones which cannot be justified with the question. Here is an example for you. • Question: Ages of A and B are in the ratio 7:4, after 5 years, the ratio becomes 11:7. What is the age of A? Options: A. 11, B. 18, C. 21, D. 28 • Now, you know the age of A must be a multiple of 7, and you can quickly eliminate option A and B. Now pay attention to option C, if we take the age of A as 21, then after 5 years, A will be 26 years old. However, 26 is not a multiple of 11, and according to the question, A’s age after 5 years should be a multiple of 11. There you go, eliminate option C too. Now you’re only left with option D which is the answer. 28 is indeed a multiple of 7 and after 5 years it would become 33, which happens to be a multiple of 11
Don’t compute everything, use options to identify • If you are given a complex calculation to do, just think for a second, there has to be a better way to do it. Because complex calculations are not tested in an aptitude test, your smartness is. Below is an example to for more clarity. • Question: 3812 + 5972 =? Options: A. 456284, B. 658598, C. 765454, D. 501570 • Now, to arrive at your answer, you can either manually calculate the squares or you can think in a smarter way. Square of 381 will definitely have the last digit of 1. (11) 2; is 121, (21)2 is 441, (31)2 is 961, and so on. So, 3812 would be something like this xxxxx1. Similarly, square of 597 would be something like this, xxxxx9. 7 2 is 49, and the last digit is 9, so 5972 has to end with 9. Now that you have 2 numbers, xxxxx1 and xxxxx9, just add them like an old fashioned addition question
Use effective percentage • The concept of effective percentage can help to reduce your calculation time dramatically. • You must have seen poster and banners outside shops offering 50% + 30% discount. The same kind of questions can be seen in most aptitude tests
Learn basic percentages • If you want to calculate 10% of something, you would cut the zero at the end, or put a decimal. This much is known by most people and they don’t do (number x 10/100). But what to do when you want to calculate 25% of a number? Or 76% of a number? You must be equipped with basic percentage rules to solve these things quickly.