Copyright 2008-2011 Taina Maria Miller. EDITION 1.2 All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, or by any information storage and retrieval system, without permission in writing from the author. Copying permission: Permission IS granted for the teacher to reproduce this material to be used with students, not commercial resale, by virtue of the purchase of this book. In other words, the teacher MAY make copies of the pages to be used with students. 2
Math Mammoth Place Value 4 Contents Introduction... 4 Thousands... 6 Rounding... 9 Estimating... 13 At the Edge of Whole Thousands... 15 More Thousands... 17 Practicing with Thousands... 19 Place Value with Thousands... 21 Comparing with Thousands... 23 Adding & Subtracting Big Numbers... 26 A Little Bit of Millions... 31 Multiples of 10, 100 and 1000... 34 Review... 36 Answers... 38 More from Math Mammoth... 45 3
Introduction In Math Mammoth Place Value 4, the focus is on place value with thousands, ten thousands, and hundred thousands - in other words till one million, and a little bit even beyond. The book is most suitable for fourth grade. The first lessons only deal with thousands or numbers with a maximum of four digits. These are for review and for deepening the student's understanding of place value. It is crucial that the student understands place value with these numbers before moving on to larger numbers. Yet again, these larger numbers can be very easy as long as the student understands the basics of how our place value system works. The lesson More Thousands then introduces numbers beyond 10,000. After learning these larger numbers, we also study addition and subtraction, comparing, and the idea of multiples. In addition to column-form addition and subtraction, the book also contains a lot of mental math problems. In studying mental addition and subtraction, the similarities to adding smaller numbers are stressed, which helps the students to understand how to add/subtract these bigger numbers. I wish you success with math teaching! Maria Miller, the author 4
Helpful Resources on the Internet Use these free online resources to supplement the bookwork as you see fit. You can access an up-to-date online version of this list at www.mathmammoth.com/weblinks/place_value_4.htm Place Value Playoff Match numbers written in standard form with numbers written in expanded form in this game. http://www.quia.com/mc/279741.html Megapenny Project Visualizes big numbers with pictures of pennies. http://www.kokogiak.com/megapenny/default.asp Keep My Place Fill in the big numbers to this cross-number puzzle. http://www.mathsyear2000.org/magnet/kaleidoscope2/crossnumber/index.html Place value puzzler Place value or rounding game. Click on the asked place value in a number, or type in the rounded version of the number. http://www.funbrain.com/tens/index.html Estimation at AAA Math Exercises about rounding whole numbers and decimals, front-end estimation, estimating sums and differences. Each page has an explanation, interactive practice, and games. http://www.aaamath.com/b/est.htm Can you say really big numbers? Enter a really big number, try say it out loud, and see it written. http://www.mathcats.com/explore/reallybignumbers.html 5
Thousands one (o) ten (t) hundred (h) Look at the pictures. How many... ones go into a ten? tens go into a hundred? hundreds go into a thousand? That is why our way of writing numbers is called the base ten system. Writing the number 5,608 in expanded form means we write out the number as a sum of whole thousands, whole hundreds, whole tens, and ones. You see all of it right from the number: th h t o 7 2 8 4 thousand (th) 7,284 has 7 thousands, 2 hundreds, 8 tens, and 4 ones. 1. Write the numbers in expanded form. It has 5 thousands = 5,000. It has 6 hundreds = 600 It has 0 tens = 0. It has 8 ones = 8. a. 8,325 = 8000 + 300 + 20 + 5 b. 4,935 = c. 4,039 = d. 3,002 e. 2,090 = f. 9,405 Now write it as a sum: 5,608 = 5,000 + 600 + 0 + 8 2. Write in normal form. a. 4000 + 500 + 90 + 3 b. 2000 + 90 c. 3000 + 200 d. 8000 + 5 e. 1000 + 80 + 7 f. 5000 + 600 + 9 g. 6 hundred 4 thousand h. 8 tens 4 thousand i. 3 ones 7 thousand 2 hundred j. 4 hundred 5 ones 1 thousand k. fifty, 7 thousand l. 4 thousand, 5 m. 9, sixty, 4 thousand n. 8 hundred, 3 thousand, 9 6 Math Mammoth Place Value 4 (Blue Series)