Skip to main content

Quantitative Aptitude Formulae

HCF and LCM

For two numbers, HCF x LCM = product of the two. 

HCF of Fractions =HCF of Numerator

                              LCM of Denominator


 LCM of Fractions =LCM of Numerator

                                HCF of Denominator


 Relatively Prime or Co-Prime Numbers: Two positive integers are said to be relatively prime to each other if their highest common factor is 1.



Divisibility Rules 

A number is divisible by: 2, 4 & 8 when the number formed by the last, last two, last three digits are divisible by 2,4 & 8 respectively. 3 & 9 when the sum of the digits of the number is divisible by 3 & 9 respectively.

11 when the difference between the sum of the digits in the odd places and of those in even places is 0 or a multiple of 11. 

6, 12 & 15 when it is divisible by 2 and 3, 3 and 4 & 3 and 5 respectively. 

7, if the number of tens added to five times the number of units is divisible by 7. 

13, if the number of tens added to four times the number of units is divisible by 13. 

19, if the number of tens added to twice the number of units is divisible by 19.

Comments

Post a Comment

Popular posts from this blog

Reasoning: Alphabet Test and Miscellaneous Series

Position of Alphabets A-   A- One brand B-   Bi- ttu D-    For -D F-   F- ix G-  G- iven H-   H- eight K-   K- elvin M-   M- 13  hero N-    14 th November P-    Pre- sixteen T-    T- 20 E-5 J-10 O-15 T-20 Y-25 C-3 F-6 I-9 L-12 O-15 R-18 U-21 X-24 G-7 L-7+5=12 Q-12+5=17 V-17+5=22 I-9 S-19 C-3 M-13 W-23
Post a Comment
Read more

Quantative Aptitude - Number series

      There are a number of points to remember while solving  Number Series Different ways of solving no. series +1,+2,+3,+4 -1,-2,-3,-4 +1,-1,+1,-1 Perfect square series - This type of series is based on square of a number which is in same order and one square number is missing in that series.                                                                    Example - 441,484,529,576,.?..                                                                                                        Answer -441= 21², 484= 22², 529= 23², 57...
Post a Comment
Read more

Simple Interest

Simple interest formula is one of the methods of calculating the interest on a certain amount. First, it is important to recall the concept of interest and ways to calculate it. When you borrow money from a bank, there is an extra amount to be along with the amount you borrowed. That extra money that you pay is called interest. Some money lenders and financial institutions also charge this interest for the money borrowed. There are two types of interest levied upon: Simple Interest, and Compound Interest It should be noted that the simple interest is paid at the end of a specific time period and is always a fixed amount that the borrower has to pay. The   simple interest   is calculated using a formula which is described below along with an example question. Formula for Simple Interest Simple interest is calculated by multiplying the interest rate by the principal amount and the time period which is generally in years. The S.I. formula is given as: Simple Interest (SI) = P × T...
Post a Comment
Read more