[1] Tell the missing digit [Step 1] : Choose a large number of six or seven digits. [Step 2] : Take the sum of digits. [Step 3] : Subtract sum of digits from any number chosen. [Step 4] : Mix up the digits of resulting number. [Step 5] : Add 25 to it. [Step 6] : Cross out any one …

[1]  Getting a three-digit integer written twice Consider any three-digit integer. Multiply it by 11, and the overall answer by 91. Now, the result is the original integer written twice. Example [I] Suppose today your friend is 12 years old and he was born in 1976. [Step 1] : Consider the three-digit integer, say:    456 [Step 2] : Multiplying this …

[1] The age from phone number To tell the age of anyone, ask him to write down last four digits of a telephone number. Suppose the four digits are 8231. Let him conceive a new four digit number by placing the above digits in a new order, say 2318. Now, subtract the smaller number from the bigger one. In this …

[1] The sum of a square of three numbers in a calendar Ask your friend to choose three successive dates from a calender. Let him do so in a column starting with the lowest number. You can tell the sum of 9 digits of the square so formed. How? Ask your friend the least number he had thought of. Add …

How do mathematicians communicate? What is a googol? What is a prime number? How does algebra differ from arithmetic? What is plane geometry? What is polygon? What are quadrilaterals? What is a circle? What is solid geometry? How do mathematicians communicate? You would miss much of the enjoyment of traveling through any new land unless you knew enough of the …

Symmetry in Mathematics – Symmetry comes from a Greek word meaning ‘to measure together’ and is widely used in the study of geometry. Mathematically, symmetry means that one shape becomes exactly like another when you move it in some way (turn, flip or slide). Types of Symmetry There are three basic types of symmetry: rotational symmetry, reflection symmetry and point symmetry. …

Numbers and Numerals – A number is a theoretical concept, and a numeral is the way that people denote that concept. A numeral contains one or more written symbols, but a number can be expressed in a range of ways. Number and numeral are often used interchangeably, but there is a slight difference between them. Numbers and Numerals? What is a …