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Tài liệu Math fractions and graphs l3

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e a rni ng L3 Mathematics Ex pre ss Fractions and Graphs This book belongs to Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic Copyright © 2005, 2010 by Scholastic Inc. Copyright © 2013 by Scholastic Education International (Singapore) Private Limited All rights reserved. Previously published as Reading & Math Jumbo Workbook Grade 3 and 4, Summer Express 2-3, Summer Express 3-4, Success with Math Grade 2 and Success With Addition & Subtraction Grade 2 by Scholastic Inc. This edition published by Scholastic Education International (Singapore) Private Limited A division of Scholastic Inc. No part of this publication may be reproduced in whole or in part, or stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise without the written permission of the publisher. For information regarding permission, write to: Scholastic Education International (Singapore) Private Limited 81 Ubi Avenue 4 #02-28 UB.ONE Singapore 408830 [email protected] First edition 2013 ISBN 978-981-07-1372-0 Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic Welcome to eEa rpnreisns g ! x Helping your child build essential skills is easy! These teacher-approved activities have been specially developed to make learning ERWKDFFHVVLEOHDQGHQMR\DEOH2QHDFKSDJH\RX¶OO¿QG f ractions review Focus Skill The focus of each activity page is clearly indicated. Date: A fraction consists of two parts.   3 T  henumeratorWHOOVKRZPDQ\SD UWVDUHEHLQJLGHQWL¿HG 4 The denominatortells the total number of equal parts in the whole. Write the fraction that equals 1. the part that is shaded. 2. VKDGHGSDUWV VKDGHGSDUWV SDUWVLQDOO  4. VKDGHGSDUWV Meaningful learning Each activity has been carefully designed to make your child’s learning meaningful and fun. Instructions The read-aloud instructions are easy for your child to understand. SDUWVLQDOO VKDGHGSDUWV SDUWVLQDOO Write the fraction for each word 5. one-third 6. six-eighths 8. IRXU¿IWKV 9. ¿YHWHQWKV 6 SDUWVLQDOO name. 7. 10. two-sixths eight-tenths )UDFWLRQDQG*UDSKVÔ/ L3 Fractions and Graphs.indd 6 7KLVERRNDOVRFRQWDLQV ea rn i ng Fr aRcertariaoacdcntitsincicageenSd kGi lrl sa p h s TTe s t PP Fill in the bubble next to the correct 1. Which fraction describes the shaded part of the circle? Expre ss answer. 3. Which fraction describes the shaded part of the square? Cong ratulatio ns! I, 2. 62 A 3 5 A 1 6 B 2 5 B 2 6 C 1 3 C 3 6 D 1 4 D 4 6 Which fraction describes the shaded part of the circle? 4. Which fraction describes the shaded part of the square? A 3 4 A 3 4 B 6 8 B 2 4 C 5 8 C 1 4 D 1 2 D 1 2 or draw a Paste a photo lf. picture of yourse I ha ve co tic Su pe rs ta r! am a Sc ho las hs L3 . tio ns an d Gr ap mp let ed Fr ac Pre sen ted on &RPSOHWLRQFHUWL¿FDWH to celebrate your child’s leap in learning. )UDFWLRQDQG*UDSKVÔ/ L3 Fractions and Graphs.indd 62 Instant assessment to ensure your child really masters the skills. Motivational cut-and-paste stickers to mark the milestones of your child’s learning path. Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic Contents Fractions and Graphs 5 fractions review 6 identifying parts of a whole 7–8 equivalent fractions 9 making equivalent fractions 10–12 reducing fractions to lowest terms 13–17 comparing fractions 18–21 adding fractions with like denominators 22–25 adding fractions with related denominators 26–29 subtracting fractions with like denominators 31–34 subtracting fractions with related denominators 35–38 word problems 39–43 reading bar graphs 44–46 reading and creating bar graphs 47–49 ordered pairs and coordinates 50–61 Fractions and Graphs Practice Test 62–73 Answer Key Certificate Cut-and-Paste Stickers 74–77 78 79 Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic Fractions and Graphs ,I\RXUFKLOGOLNHVWRFRRNKHRUVKHZLOO¿QGLWYHU\KHOSIXOWR understand fractions. Most recipes have ingredients that are measured in fractions. Graphs are important to understand because they can show a great deal of information in a way that is fun and easy to read. What to do The activities in this section introduce your child to concepts related to fractions and graphing. Read the directions together. Have your child complete the activity. Then together, review his or her work. Reward your child with a sticker for work that is well done! Keep On Going! Use food to reinforce fractions. For example, have your child count the number of slices of pizza in the pan. Ask questions such as “Dad ate 3 pieces of pizza. What fraction describes the amount of pizza he ate?” 3 Continue asking questions 8 using other family members. Challenge your child to use the information to make a bar graph. Label the vertical axis 1–8. Label the horizontal axis with the names of the family members. Bet you didn’t know you could eat math! () )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic 5 f ractions review 'DWH A fraction consists of two parts. 3 4 The numerator WHOOVKRZPDQ\SDUWVDUHEHLQJLGHQWL¿HG The denominator tells the total number of equal parts in the whole. Write the fraction that equals the part that is shaded. 1. 2. shaded parts shaded parts parts in all parts in all  4. shaded parts shaded parts parts in all parts in all Write the fraction for each word name. 5. one-third 6. six-eighths 7. 8. IRXU¿IWKV 9. ¿YHWHQWKV 10. 6 two-sixths eight-tenths )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic identifying parts of a whole 'DWH Fill in the blanks. Chester Chipmunk was cutting cakes and pies. Bobby Bear said, “Some aren’t cut in half. When you cut something in half, there are _____________ pieces and both the pieces are of the same _____________.” Here is how Chester cut the cakes and pies. Circle the desserts that are cut in half correctly. 1. 4. 2. 5.  6. )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic 7 identifying parts of a whole 'DWH Here is a recipe for preparing peanut butter-oatmeal drops. Gather the ingredients and follow the instructions given. No-Bake Peanut Butter-Oatmeal Drops (makes about 30 1-inch drops) cup peanut butter (smooth or crunchy) cup corn syrup cup confectioner’s sugar cup powdered milk cup uncooked oatmeal Mix all the ingredients together. Roll into balls. Chill for about one hour. Then eat! Now try these fraction pictures. Can you write the fraction each SLFWXUHVKRZV"7KH¿UVWRQHKDVEHHQGRQHIRU\RX 1. 2.  4. 6. 7. 8. 3 6 5. 8 )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic equivalent f ractions 'DWH Equivalent fractions have the same amount. 4 1 = 8 2 3 1 = 6 2 Write each missing numerator to show equivalent fractions. 1.  2. 1 = 2 4 5. 1 = 3 6 6. 1 = 5 10 4. 1 = 8 4 7. 1 = 2 8 1 = 3 9 8. 1 = 2 16 1 = 4 20 Write the number sentence that shows each set of equivalent fractions. 9. 10. = 11. = 12. = = )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic 9 making equivalent f ractions 'DWH 0XOWLSO\ERWKWKHQXPHUDWRUDQGWKHGHQRPLQDWRUE\WKHVDPHQXPEHUWR¿QG equivalent fractions. 2 × 4 8 = 4 × 4 16 Find the missing term to make each pair of fractions equivalent. 1. 3 15 = 4 2. 4 12 = 6  4. 4 16 = 9 5. 3 = 5 25 6. 7. 8 = 9 27 8. 3 = 7 21 9. 4 16 = 5 2 = 3 9 11. 14 7 = 10 12. 5 = 6 36 10. 10 )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic 5 = 8 32 3 9 = 11 making equivalent f ractions 'DWH Find the missing terms in each row of fractions. 1. 1 = = = = 3 6 9 12 15 2. 3 15 12 = = = = 4 8 12  2 6 10 = = = = 3 6 12 4. 4 8 20 = = = = 5 15 20 5. 1 3 5 = = = = 6 12 24 6. 3 6 9 = = = = 7 28 35 )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic 11 making equivalent f ractions 'DWH In each fraction wheel, make the fractions equivalent to the fraction in the center. 1. 2. 8 9 6 12 6 5 1 4 2 15 3 5 7 12  25 35 6 18 4. 2 14 5 1 9 3 6 2 20 4 6 16 8 5. 28 6. 21 4 16 18 3 24 35 25 8 5 12 2 40 12 6 1 15 )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic reducing f ractions to lowest terms 'DWH To reduce a fraction to lowest terms, divide both the numerator and the denominator evenly by the same number. 4÷2 2 = 4 8÷2 4÷4 1 = 2 8÷4 2÷2 1 = 2 4÷2 Divide by 2. Can you divide again? Yes! Divide by 2. Can you divide again? No! or Divide by 4. Can you divide again? No! 1 4 1 and are equivalent fractions, but is in the lowest terms. 2 8 2 Reduce each fraction to lowest terms. 2÷ 1. 4÷ 6÷ = 2. 10 ÷ 4. 15 ÷ = 5. 6÷ 8÷  8÷ 8. = 6. 11. 9÷ 15 ÷ = 12 ÷ = 7÷ = 9. 5÷ = 10 ÷ 10 ÷ 3÷ = 6÷ 10. = 4÷ 3÷ 7. 9÷ 5÷ = 14 ÷ 4÷ = 12. 16 ÷ )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic =  reducing f ractions to lowest terms 'DWH Write the fraction for each shaded box. Reduce to lowest terms. Then draw the reduced fraction in the empty box. 1. 2. ÷ ÷ = = ÷ ÷  4. ÷ ÷ = = ÷ ÷ 5. 6. ÷ ÷ = = ÷ ÷ 7. 8. ÷ ÷ = ÷ 14 = ÷ )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic reducing f ractions to lowest terms 'DWH Reduce each fraction to lowest terms. Then use the code to answer the riddle below. O S 2 1 = 4 4 2 = 14 B A 10 2 = 15 2 1 = 32 ! E 2 1 = 16 T 2 1 = 12 22 = 24 12 N D H 4 2 = 10 10 1 = 100 Y 2 1 = 24 2 1 = 26 R P 2 1 = 28 M 4 = 16 4 L 2 1 = 8 2 1 = 18 Why was the math teacher crying? ___ ___ 5 8 ___ ___ ___ ___ 13 3 12 14 ___ ___ ___ 5 3 ___ ___ ___ 10 11 2 2 ___ ___ ___ ___ ___ ___ ___ ___ ___ 1 4 2 16 9 8 13 7 )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic 6 15 reducing f ractions to lowest terms 'DWH Reduce each fraction to lowest terms. 1. 10 = 20 2. 6 = 36  3 = 15 4. 9 = 30 5. 25 = 30 6. 5 = 20 7. 2 = 8 8. 6 = 18 9. 16 = 24 10. 20 = 24 11. 14 = 35 12. 12 = 30 16 )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic reducing f ractions to lowest terms 'DWH Reduce each fraction to lowest terms. 1. 12 = 14 2. 30 = 40  8 = 32 4. 12 = 40 5. 10 = 40 6. 15 = 30 7. 4 = 16 8. 4 = 12 9. 15 = 21 10. 14 = 21 11. 12 = 36 12. 21 = 24 )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic 17 comparing f ractions 'DWH Use the fraction strips to compare the fractions on pages 19 to 21. 1 Whole 1 1 2 2 1 1 1 3 3 3 1 1 1 1 4 4 4 4 1 1 1 1 1 5 5 5 5 5 1 1 1 1 1 1 6 6 6 6 6 6 1 1 1 1 1 1 1 7 7 7 7 7 7 7 1 1 1 1 1 1 1 1 8 8 8 8 8 8 8 8 1 1 1 1 1 1 1 1 1 9 9 9 9 9 9 9 9 9 1 1 1 1 1 1 1 1 1 1 10 10 10 10 10 10 10 10 10 10 1 1 1 1 1 1 1 1 1 1 1 11 11 11 11 11 11 11 11 11 11 11 1 1 1 1 1 1 1 1 1 1 1 1 12 12 12 12 12 12 12 12 12 12 12 12 18 )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic comparing f ractions 'DWH Write >, < or = in the box. > (more than) < (less than) = (equal) 2. 4 9 7 9 3 10 5. 5 8 3 8 5 11 12 8. 5 5 10 10 9. 3 3 4 7 11. 8 3 4 5 12. 8 1. 3 4 2 4 4. 7 10 7. 6 10. 5  5 6 1 6 6. 7 3 2 3 2 1 2 7 5 6 )UDFWLRQVDQG*UDSKVÔ/  Scholastic Learning Express: Fractions and Graphs, Level 3 © Scholastic 19
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