This document describes a method for quickly calculating the square of numbers ending in 5. It involves writing down 25 as the last two digits. Then, the first digit is multiplied by its successor and written in front of the 25. Examples provided show squaring 45, 85, and 125 using this method.
Python Notes for mca i year students osmania university.docx
Square of Numbers that end in 5
1. Description:
This method is limited to the
numbers that have 5 in its unit’s
place. With the help of these
methods you will be able to find the
square of any number that ends in 5
within a fraction of seconds.
2. Method:
1. Always remember the square of
a number ending in 5 will be 25.
2. Write 25 as the last two digits of
your answer.
3. For the front part, multiply the first
digit with its successor.
4. Write down the product as the
front part of your answer.
3. Examples:
Find the Square of
1. 45
Answer after first step: _ _ 2 5
Successor of 4 is 5.
Product of 4 & 5 = 20 (Front Part)
Answer after second step: 2 0 2 5
4. Examples:
Find the Square of
1. 85
Answer after first step: _ _ 2 5
Successor of 8 is 9.
Product of 8 & 9 = 72 (Front Part)
Answer after second step: 7 2 2 5
5. Examples:
Find the Square of
1. 125
Answer after first step: _ _ _ 2 5
Successor of 12 is 13.
Product of 12 & 13 = 156(Front Part)
Answer after second step: 1 5 6 2 5
