Monday , 18 January 2021

# Mathematics For Kids

## यूक्लिड: विश्व के महानतम गणितज्ञ

बीसवीं सदी के महानतम वैज्ञानिक अल्बर्ट आइंस्टीन का मानना था कि यूक्लिड वह महान शखिसयत थे, जिन्होंने दुनिया को तार्किकता सिखायी। आज पूरी दुनिया जो ज्यामिति पढ़ रही है, यूक्लिड उसके जन्मदाता है। ईसा से 350 साल पहले जन्मे यूक्लिड सिर्फ गणितज्ञ ही नहीं थे, बल्कि कला, संगीत तथा प्रकाश विज्ञान के भी विद्वान थे। वह भी उस कोटि के …

## Number Tricks – 2

 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 …

## Number Tricks – 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 …

## Number Recreations – 2

 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 …

## Number Recreations – 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 …

## Language of Mathematics

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 …