SAMPLE PAPERS FOR SBI CLERK EXAM BY LEEPE TUTORIALS
MATHEMATICS Mathematics is an important section of SBI clerk exam. Today we will discuss about the basics of math. This will help you a lot. Everyone knows how to solve a question but what matters is your Speed and Accuracy. And for that you should know the basics of Maths.
Introduction to Number Systems Natural Numbers: All positive integers are natural numbers. Example: 1,2,3,4,8‌‌‌ There are infinite natural numbers and number 1 is the least natural number.
Classification of Natural Numbers Based on divisibility there would be two types of natural numbers. They are PRIME and COMPOSITE.
Prime Numbers: A natural number larger than unity is a prime number if it does not have other divisors excepts for itself and unity.
Note: Unity i.e. , 1 is not a prime number.
Properties of Prime Numbers
Process to Check a Number is Prime or not •
Take the square root of the number.
•
Round of the square root to the next highest integer call this number as Z. Check for divisibility of the number N by all prime number below Z. If there is no numbers below the value of Z which divides N then number will be prime.
Example 239 is prime number or not?
Composite Numbers The number which are not prime are know as composite numbers.
Co- Primes: Two number a and b are said to be co-primes, if their H.C.F is 1 Example (2,3), (4,5), (7,9), (8,11)‌‌. Place value or Local value of a digit in a Number.
Place Value Example 689745132 Place value of 2 is (2x1) = 2 Place value of 3 is (3x10) = 30 and so on.
Face Value It is the value of the digit itself at whatever place it may be. Example 689745132 face value of 2 is 2 Place value of 3 is 3 and so on.
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