# Happy maths 1: numbers

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Happy Math 1: Numbers, by Mala Kumar

©Pratham Books, 2007 First Edition 2007Illustrations: Angie&Upesh ISBN 978-81-8263-906-5Registered Office: PRATHAM BOOKSNo.633/634, 4th “C” Main, 6th ‘B’ Cross, OMBR Layout, Banaswadi,Bangalore- 560043.&080 - 25429726 / 27 / 28 Regional Offices:Mumbai&022 - 65162526 New Delhi&011 - 65684113 Typsetting and Layout by: The Other Design StudioPublished by: Pratham Books (External Link) 

Sankhya and Ganith have been learning a lot of things in their mathematics class.Join Sankhya and Ganith in their happy discoveries about mathematics.Zzero and Eka are friends of Sankhya and Ganith. In this book Sankhya and Ganith discover the magic of numbers. They think of numbers as their friends.They want to share some of the things they have found out about numbers.They learnt about numbers from stories that they read in many books in their school library.

## The big challenge

Eka: Zzero ! Will you stop bouncing around like this, please?
Zzero: I’m happy. So I’m bouncing. I can take on so many shapes.

Eka: Stop boasting. Do you know how many numbers you can make up? 0, 10s, 100s, 1,000s and 10,000s. That’s a lot of numbers.0, 10, 20, 30, ….90, 100, 101, 110, 200, 201, 210, ….

Zzero: Please stop! I want to find out how many numbers exist between 0 and 10,000 with one or more zeroes in them. The firstone is 0 and the last is 10,000 so that makes two…

Eka: Zzero, hats off to you for saying you will take up such a BIG challenge. I think you should first try to find out how manynumbers have one or more zeroes between 0 and 1,000.

## Grains of rice

Acharya Vinoba Bhave was a freedom fighter. He followed the teachings of Mahatma Gandhi and lived between the years 1895and 1982.

When he was a young boy in Maharashtra, his mother had made a vow of offering 10,000 grains of rice to God. She carefully counteda hundred grains each day and offered it in prayer, reciting God’s name each time she made an offering.

Vinoba’s elder brother had an idea. He said, “Mother, why do you do this everyday? After counting a hundred grains on oneday, measure its weight. From the next day, you just have to weigh out an equal amount and offer it to God. This will save youtime and effort.”

Vinoba said, “I don’t think that would be right. When you count 100 grains of rice each day, you will repeat God’s name 100 times.But if you weigh out 100 grains, you would say God’s name only once!”

Vinoba’s mother wanted tooffer 10,000 grains of rice. If each grain weighs half agram, how many grams will 100 grains weigh?

50 grams. If one grain weighs half-a-gram, 2 grains will weigh 1gm. How many 2’s in 100? $\frac{100}{2}=50$ . $50\times 1=50$ .

If Vinoba’s mother had counted hundredgrains on Day 1, and then followed her elder son’s advice,how many times would she have said God’s name till she made the complete offering?

199 times. On Day 1, she would have uttered God’s name 100 times while offering hundred grains. That would leave 9900grains (10 thousand minus 100 = 9900). 9900 divided by $100=99$ . $100+99=199$ .

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
hi
Loga
what does nano mean?
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
how did you get the value of 2000N.What calculations are needed to arrive at it
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