Math Stew - Bits 'n Bites - Part 1 (Full Lenght Video)

De la série « MathXplosion - English »

Quest for Roman Numerals 
What do C, D, I, L M, V and X represent? They're Roman numerals – created thousands of years ago and still used today. Join Eric on his quest for Roman numerals. It's not magic… it's math! 

The Educational Gist: This segment explores an alternate way to communicate numbers using the anchor numbers 5 and 10 and the ancient counting system based on letters from the Roman alphabet. Roman Numerals were used throughout Europe, well into the middle ages, and still appear in the names of monarchs, the production year of films, on buildings, and on timepieces. 

Take Note of Musical Fractions 
Break down a song by counting how long the notes are in action – it's musical fractions! Then join Eric as he creates his own cool song, using what else? Fractions of course! It's not magic… it's math! 

The Educational Gist: This segment is about patterns in rhythms and musical notes, and the role of fractions in denoting whole, half, and quarter notes, and creating distinct sounds. 

The Mysterious Multiplying Erics 
Eric travels into another dimension! Look deep into the mathemagician's secret mirrors and mysterious illusions will abound. It's not magic… it's math! 

The Educational Gist: A mirror reflects everything in front of it including another mirror. If you place two mirrors at an angle, you will see an ever-increasing number of objects as you move the mirrors closer together (reducing the angle between them); if the two mirrors are parallel, you can see infinity. 

Pick a Block of Dates – Any Block 
A trick you can do by calculating the sum of a 3-by-3 block of dates on a calendar without using a calculator. It's not magic… it's math! 

The Educational Gist: This segment introduces the concept of the mean (or average): the number in the middle square is the mean of the nine numbers that form the 3 X 3 square. If you add all the numbers and divide by nine (the number of squares) the answer is the number in the central position. So, to find the sum of the nine numbers quickly, just multiply the number in the middle by 9. 

Reflecting on Mirror Writing 
Mirror, mirror on the wall, can you read Eric's handwriting at all? Eric explores the mathemagical mystery of secret messaging mirrors. It's not magic… it's math! 

The Educational Gist: This segment is about mirror writing – formed by writing in the direction that is the reverse of the natural way for a given language, so that it appears normal when it is reflected in a mirror. The most common modern usage of mirror writing can be found on the front of ambulances, where the word "AMBULANCE" is often written in very large mirrored text, so that drivers see the word the right way around in their rear-view mirror.

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