Awesome Arithmetricks – Kjartan Poskitt

It’s the same with the times tables, but how do we make some of the numbers interesting? The first thing to do is get RID of a lot of them. Hurrah! We’ll start by looking at the “1” on the top. As you look down the column, you’ll see the numbers just go 1,2,3 and so on because if you multiply any number by 1 you just get the same number again.

(You might think this is obvious, but it took the pure mathematicians thousands of years to decide sums like 7×1 = 7 were all right. No – don’t laugh, that’s cruel…) Of course this also works with the “1” on the side, if you look along the row, again you just get 1, 2, 3. These are so simple, that we may as well make the table smaller by leaving all these out too.

Now look at the “10” on the top. As you look down the column, you’ll see you just get 10, 20, 30 and so on. This is because of a very nifty arithmetrick which says that… To multiply any number by 10, you move it all one place to the left and then plonk an extra 0 on the end. Look at this: x 10 = 5810 See? This makes multiplying by tens very simple too, so we’ll leave all the tens off the table.

By now we’ve decided that out of our 100 numbers, 36 of them are too simple to bother with, so let’s see the table again: There, that’s a bit better isn’t it? We’ve only got 64 numbers left. Just a minute though – if you look you’ll start to see a lot of the numbers turn up TWICE.

This is because multiplication can work either way round (i.e. 9 x 4 is the same as 4 x 9). There’s no point in learning anything twice is there? No, so we’ll get rid of another large chunk of numbers to make… The terribly INTERESTING table Now then, let’s see if we can find some of these numbers interesting.

Maybe your birthday is on the 18th of the month. If you find 18 on the table you’ll see that 18 is 3 x 6 (or 6 x 3 of course), so you could tell everybody it’s the 3 x 6 of the month. With a bit of luck they might get confused and give you presents on the 3rd, the 6th AND the 18th.

Nice one! Another interesting number might be your house number. Suppose it’s number 32.

With many thanks to Tracey Turner at Scholastic. This is the tenth book we’ve worked on together and it’s been fun all the way. Scholastic Children’s Books, Euston House, 24 Eversholt Street, London NW1 1DB, UK A division of Scholastic Ltd London ~ New York ~ Toronto ~ Sydney ~ Auckland Mexico City – New Delhi ~ Hong Kong First published as The Essential Arithmetricks by Scholastic Ltd 1999 This edition published 2008 Text copyright © Kjartan Poskitt 1999 Inside illustrations copyright © Daniel Postgate 1999 Cover illustration copyright © Rob Davis 2008 All rights reserved ISBN 978 1407 10585 7 Typeset by TW Typesetting, Midsomer Norton, Somerset Printed in the UK by CPI Bookmarque, Croydon, CR0 4TD 10 98765432 The right of Kjartan Poskitt, Daniel Postgate and Rob Davis to be identified as the author and illustrator of this work respectively has been asserted by them in accordance with the Copyright, Designs and Patents Act, 1988.

This book is sold subject to the condition that it shall not, by way of trade or otherwise be lent, resold, hired out, or otherwise circulated without the publisher’s prior consent in any form or binding other than that in which it is published and without a similar condition, including this condition, being imposed upon the subsequent purchaser.

Papers used by Scholastic Children’s Books are made from wood grown in sustainable forests. Contents What are the essential arithmetricks? 5 Back to the sandpit 9 Awful addition 19 Some sneaky signs 32 Sickly subtraction 53 A cracking code! 67 The terrible tables 71 Maddening multiplication 93 Some more sneaky signs 102 Diabolical division 107 Smaller trousers and the golden promise 135 When nothing means something 145 Rough sums and going mental 153 The sneakiest signs! 153 The fiendish formula! 172 Oh no!

Look… 175 For a full A-Z guide to Murderous Maths, and details of the other titles in the series, visit www.murderousmaths.co.uk What are the essential arithmetricks? Everybody can be utterly brilliant at something, but it doesn’t matter whether it’s conjuring, cooking, carpentry or even kissing, you have to start at the bottom and get to grips with the bare essentials.

ARbYvuSuZe vVoO START fiT WE gormn? In maths the bare essentials – adding, subtracting, multiplying and dividing – are called “arithmetic”.

This is a short excerpt from the opening of “” by Unknown, quoted for review and introduction purposes. All rights belong to the copyright holders.

Book Information

• Unique ID: a8ba6674d28d47b7
• File Extension: .pdf
• File Size: 5,704,712 bytes (5.44 MB)
• Title: –
• Author: Unknown
• ISBN: 9781407105857, 1724272225
• Pages: 181
• Language: English (en)

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• Estimated Reading Time: 142.06 minutes
• Total Words: 28,413
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