Solve it - Question 1

-
Dear All

Find the sum of digits of number 1000^20 – 20 expressed in decimal notation.



Click here for answer.

Comments

Post a Comment

Popular posts from this blog

PROJECT WORK TOPICS FOR CLASS IX AND X

-
--> Dear All We are well aware that CBSE is acknowledging the concept of internal assessment in Mathematics for the past three years wherein a student studying in class IX and X is supposed to submit a project work in Mathematics. This project can be in the form of extended learning in the subject or related to real life situations as well. Click here to download the evaluation performa for the same. I have observed that students are usually confused while selecting the topic for their project work. That is why; I want to share a few possible topics to help them pick up a suitable topic which suits their aptitude and attitude (as separate posts). Students will have the liberty to take the decision of taking up individual or a group projects (though they need the consent of their concerned math's teacher!). I would also discuss (in brief) about each topic and share some related resources which may prove to be helpful. few suggested topics are: 1. day on given ...
Read more

Special properties of number 27 (Today’s Date)

-
1. Twenty-seven is a perfect cube = 3^3. 2. In base 10, it is the first composite number not evenly divisible by any of its digits. 3. 27 is the only positive integer that is 3 times the sum of its digits. 4. 27 is a Harshad number (a number divisible by sum of its digits). 5. 27 is the smallest 2-digit number in which the sum of digits is equal to the sum of prime factors, e.g.: 27 = 3 x 3 x 3 and 2 + 7 = 3 + 3 + 3 = 9 6. 23 is the largest integer which is the sum of the digits of its cube: 27^3 = 19,683 and 27 = 1 + 9 + 6 + 8 + 3 7. 27 is the number of "cubies" in a Rubik's cube. 8. The numbers of atoms in the body of an average male (about 80 kg) is about 10^27. 9. The Chemical Element Cobalt has an atomic number of 27. 10. The primitive Greek alphabet had 27 letters. 11. There are 27 signs of the zodiac in Indian astrology
Read more

Special properties of number 24 (Today’s Date)

-
1. 24 is the factorial of 4 (24 = 4!). 2. 24 is an Abundant Number. In number theory, an abundant number or excessive number is a number for which the sum of its proper divisors is greater than the number itself. The first few abundant numbers are 12, 18, 20, 24, 30, 36, ... There are only 21 abundant numbers less than 100, and they are all even. 3. 24 is the largest number divisible by all numbers less than its square root. 4. It is a highly composite number, having more divisors than any smaller number. 5. 24 is a semiperfect number, since adding up all the proper divisors of 24 except 4 and 8 gives 24. 6. Subtracting 1 from any of its divisors (except 1 and 2, but including itself) yields a prime number; 24 is the largest number with this property. 7. 24 is a Harshad number (number divisible by its sum of digits). 8. The product of any four consecutive numbers is divisible by 24. 9. 24 is the only nontrivial solution to the cannonball p...
Read more