Math Brain Teasers Difficult
Math Question: Brain Teaser?
Difficult problem, obtain the correct answer and explain well and get better response. There are two poles. One of them is 20 feet tall and the other is 10 feet high. They are spaced 40 meters (120 feet) away from each other. Each pole has a rope that extends from the top of the pole to the base of the pole. How high the ground is where the two pieces of rope to accomplish? To what extent is this meeting point from 10-foot pole?
http://img216.imageshack.us/my.php?image=figurezp2.jpg ctg B = PA / PM = BC / CD => (1) (120-x) / a = 120/10 CTG C = PC / MP = BC / AB => (2) x / a = 120 / 20 ==> from (a) and (2) ==> a = 20 / 3 (feet) x = 40 (meters) is go!
Burrs 6x6x6 VERY difficult wood brain teaser puzzles
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My Best Mathematical and Logic Puzzles (Dover Recreational Math) $1.47 The noted expert and longtime author of Scientific American’s Mathematical Games column selects 70 of his favorite “short” puzzles. Enthusiasts can challenge their skills with such mind-bogglers as The Returning Explorer, The Mutilated Chessboard, Scrambled Box Tops, Bronx vs. Brooklyn, and dozens more involving logic and basic math. Complete solutions included…. |
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iGridd – Number Logic Puzzles: Sudoku, Jigsaw, Greater/Less Than, Kakuro, Kenken, Futoshiki, Straights, Skyscraper, Binary $9.83 Number Logic Puzzles are puzzles that use numbers and a set of rules to solve them. In this category we can find Sudoku, Kakuro, Kenken, etc. The Number Logic Puzzles book consists of 375 puzzles, from very easy to quite difficult puzzles. It includes Sudoku puzzles, only 6 of them are common Sudoku and the rest use variants such as Overlapping and Diagonal Variants, and special Sudoku puzzles suc… |
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The World’s 200 Hardest Brain Teasers: Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain $2.30 FLEX YOUR brain power like never before! From acclaimed author Dr. Gary Gruber, whose proven critical-thinking methods have sold more than seven million books, this collection of mind-bending brain teasers is sure to challenge even the most experienced problem solver. Inside are logic puzzles, riddles, maddening math problems, mental games, and more! A ship is twice as old as the ship’s boiler was… |
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Square Root Puzzle $12.99 The Worldwise Imports Square Root Wood Puzzle challenges players to maneuver the largest square out through the slot in the frame without lifting, turning, or removing any of the pieces. This skill puzzle game features a durable wood construction…. |
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Melissa and Doug Math Skills Learning Mats Set $13.99 Addition, subtraction, multiplication and division are the foundation for math skills throughout our lives. What better way to engage your child in the mastery of these vital facts than with wipe-off crayons and one of these four double-sided colorful learning mats for easy and fun mealtime practice?! |
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Melissa and Doug Magnetic Wooden Numbers $11.99 Enough numerals to count from zero through twenty AND five math signs in a convenient wooden case. 37 colorful magnetic pieces can help children learn their numbers and solve basic math problems. |
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Brain Games : Brain Teasers, Logic Tests, and Puzzles to Exercise Your Mind $9.7 No Synopsis Available |
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Whole Brain Workouts Book $34.99 Select from 125 exciting, thought-provoking brain workouts to keep older adults alert and mentally healthy. Activities range from knock-knock jokes and brain teasers to puzzles and visual illusions. The activities are written with a sense of humor, positive attitude and the belief that brain challenges should also be fun. A great resource for families, activity professionals and caregivers. Includes a mental fitness evaluation and workout planner. Softcover, 180 pages. |
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Melissa and Doug Magnetic Number Maze $16.99 One for the goose and ten for the goat…the animals are counting on you! Fill each basket with the correct number of red “apples” by sliding the attached magnetic wand over the acrylic cover. Perform math-magic with no removable pieces. |
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Melissa and Doug Standard Unit Blocks $69.99 Sixty natural-finish, smooth-sanded hardwood blocks are packaged in a handsome wooden crate for easy storage. Ideal for building, balancing, and hands-on early-math learning. Great value! |
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Melissa and Doug 100 Piece Wood Blocks Set $19.99 This favorite collection of 100 wooden blocks comes in four colors and nine shapes. Your little builder will delight in stacking, building, and knocking down in countless colorful combinations, and you’ll know your child is gaining invaluable practice with fine motor skills and dexterity, color and shape recognition, and pre-math skills. |
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Melissa and Doug Jumbo Numbers Chunky Puzzle $19.99 Counting fun begins with this extra thick wooden puzzle that includes 20 easy-grasp, chunky pieces (1-20). A full-color, matching number appears under each piece, and counting pictures equal to each numbered piece are shown on the puzzle board. Number pieces stand up. Encourages hand-eye, fine motor and early math skills. |
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Melissa and Doug Sort & Snap Color Match $19.99 Toddlers will be fascinated and preschoolers will be inspired by this amazing color-matching and creative activity board! Ten reversible picture cards are held in place on a wooden play board when children place the snap caps in the holes. On one side of the picture card is in color for matching. The reverse side shows the picture in black and white, allowing the children to create their own patterns and designs! This activity is great for color recognition, sorting, and beginning math skills…even has 3-D picture suggestions! |
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Melissa and Doug Abacus $14.99 This wooden “calculator” helps teach math skills, patterning and color recognition. Slide and count the beads with this timeless counting frame. Fun activity ideas included!Extension Activities: More Ways to Play and Learn:Move any number of beads to one side of the frame. Ask the child to match your “move” on the wire below yours. This can also be done with a repetitive pattern–arrange the 10 beads in different groupings (e.g., 3 beads, 1 bead, 3 beads, 1 bead, 2 beads) that the child has to mimic on the wire below.Move a certain number of beads to one side and ask the child to count how many beads you moved and how many remain on the other side. Or have the child count from one to one hundred as they move the beads on all ten wires. |
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Melissa and Doug Grocery Store / Lemonade Stand $129.99 Whatever the season or weather, this wooden play center has the shop for you. You can decide whether to run a store or sell lemonade today! Featuring portable plastic bins for pretend shopping or storage, removable chalkboard signs, a spacious countertop and a reversible fabric awning.Extension Activities: More Ways to Play and Learn:Have the child stock the grocery store with play food by filling each bin with by color. Have him/her group like color play foods together. The result will be a colorful feast for the eyes! Have child count the number of foods of each color.Memory fun! Fill several bins in the grocery stand with one toy each. Then ask the child to study the stand. Ask the child to look away while you remove the item from one bin. Have child tell you what is missing!Demonstrate math concepts using the plastic bins. Nest the bins into two unequal stacks. Ask the child to compare the stacks. Which is taller? (Which has more bins?) Which is shorter? (Which has fewer bins?) Discuss addition by making two small stacks and counting the bins, then combining the two stacks and counting the total. You can remove bins to explore subtraction too! |
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Melissa and Doug Shape Sequence Sorting Set $14.99 Recognizing color, shape and size, and sorting objects into groups are the “building blocks” of beginning math skills. What better way to explore these important concepts than with boldly colored wooden blocks and frame! Extension activities are included to explore form, fun and function all in one toy!Extension Activities: More Ways to Play and Learn:Tallest to Smallest: Remove all blocks from the sequence board and sort them into six groups, as in Sorting Activities. Ask the child to choose the tallest blocks from each group and line them up in matching spaces at one end of the sequence board. When this is completed, ask the child to place the medium blocks in the remaining matching spaces on the sequence board. With all of the blocks in position, ask the child to point to the tallest row of blocks, the medium row of blocks and the smallest row of blocks.Add and Subtract: Place one or two blocks in the sequence board and position the sequence board in front of the child. Add one block at a time while guiding the child through addition problems. For example, you might say, “If we have one block and we add one block, how many blocks do we have in all? One plus one is two! What if we add one more block?” Point to each block, counting aloud. Encourage addition skills by continuing to add blocks. |
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Deep Brain Stimulation : A New Treatment Shows Promise in the Most Difficult Cases $24.38 No Synopsis Available |
