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Math Brain Builder Riddles Dear Colleague, Thank you checking out I have used these activities with my students for many years, and it is my hope that they will enrich your classroom also. The full bundle contains 30 different math riddles along with a complete answer key. A student scoresheet is included to allow kids to track their progress (I stamp the number of each riddle they solve). The riddles cover a variety of concepts including number sense, place value, time, money, geometry, graphing, fractions, measurement, addition, subtraction, multiplication, division, and pre-algebra. I created these activities to inspire my students to be “thinkers” as well as “solvers.” We discuss each riddle, and students share the process they used in finding their answer. These discussions are vital because they allow me to better understand the strategies kids use to solve problems. It also gets them talking about math and using the vocabulary related to the topic. As a creative teacher, you are encouraged to build upon any of these activities, and I welcome your thoughts and suggestions in regard to additions or improvements. Please feel free to contact me with any questions or concerns you may have. Sincerely, Tom Wier Copyright Notice The material presented in this download is copyrighted by Three Dog Graphx Designs. The worksheets presented in this download may be reproduced by mechanical means for in-classroom use only by the original purchaser. Copies of this material may not be given to another individual with the intent to reproduce the material for another classroom. No part of this publication may be reprinted for resale without the express written permission of Three Dog Graphx Designs. © 2010 Three Dog Graphx Designs. All rights reserved. www.threedoggraphx.com Contact information: [email protected] Mrs. Roberts class voted to see what foods they liked the best. The pie graph shows the results. What percent of the students liked hot dogs the best? Answer: _______________ Name____________________________ ----------------------------------------------------------------------------------------------- Apple Blueberry Crisp Maria helped her mom make a desert. Maria used the most of which ingredient? Answer: ________________________ Name_______________________________ ----------------------------------------------------------------------------------------------- Mr. Math Mystery has four numbers in his home address. Use the clues below to help you ÷ x + The first number is the lowest odd number. The second number is 8 times the first number. The third number is 4 more than 4 times the first number. The last number is (5x5)÷5. Answer: _______________ Name______________________________ © Three Dog Graphx Designs Lin measured her pencil to find out its length. Only one answer makes sense. Can you find it? 100 centimeters 1gram 1 kilometer 40 liters 2 meters 6 kilometers 18 centimeters 16 kilometers 50 grams Answer: __________________ Name____________________________ ----------------------------------------------------------------------------------------------- The Sherman family has a dog named Rex. Use the clues to find out how old Rex is. James is 9 years older than Rex. Maria is 2 years younger than James. Maria is 1 year older than Marcus. Marcus is 12 years old. Rex is _________ years old. Name_______________________________ ----------------------------------------------------------------------------------------------- A bear’s sense of smell is estimated to be 2,100 times better than a human’s. Which equation below displays this? (b= bear, h=human) h x 2,100 = b b + 2,100 = h 2,100 – h = b h ÷ 2,100 = b Answer: _________________________ © Three Dog Graphx Designs Hey, you’re doing algebra! Name______________________________ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Name_________________________ Math Brain Builder Riddles 1 Answers will vary, but some other ways are: 2 hundreds + 3 tens + 7 ones = 237, 200 + 37 = 237 2 Bills = $10 $10 $10 $10 $5 $5 $5 Coins = 50¢ 50¢ 50¢ 25¢ 25¢ 1¢ 1¢ 1¢ 3 9:15 (hands are reversed) 4 111 - 11 = 100 5 9 sheep are left 6 86,400 seconds 7 3 ducks in a row X X X 8 3 socks (at least two will be the same color) 9 10 days 10 total 11 50 cent piece + a nickel (one is not a nickel - it’s a 50 cent piece) 12 735 + 246 = 981, or 745 + 236 = 981 13 c. 14 110 + 190 = 300 meters 15 If you choose to double the payment each day the total is $511. If you choose $20 per day the total is $200, so the first option pays more. 16 3 pizzas 17 1 + 7, 5 + 2, 3 + 4 18 30 birds 19 177 pages 20 1,110 21 6 lines of symmetry 22 11% (hot dogs) 23 chopped apples 24 1885 25 18 centimeters 26 Rex is 6 years old. 27 h x 2,100 = b 28 4 piles with 4 crayons left over 29 b and c 30 0 (zero)