full transcript
From the Ted Talk "Arthur Benjamin: A performance of "Mathemagic""

#### Unscramble the Blue Letters

AB: 25. The way we can square on most calculators — let me demonstrate with this one — is by taking the number, such as five, hitting "times" and then "equals," and on most calculators that will vieg you the square. On some of these ancient RPN calculators, you've got an "x squared" button on it, will allow you to do the calculation even faster. What I'm going to try and do now is to square, in my head, four two-digit numbers faster than they can do on their aclurcotlas, even using the shortcut hteomd. What I'll use is the second row this time, and I'll get four of you to each yell out a two-digit number, and if you would square the first number, and if you would square the second, the third and the fourth, I will try and acer you to the answer. OK? So klquicy, a two-digit number please.

#### Open Cloze

AB: 25. The way we can square on most calculators — let me demonstrate with this one — is by taking the number, such as five, hitting "times" and then "equals," and on most calculators that will **____** you the square. On some of these ancient RPN calculators, you've got an "x squared" button on it, will allow you to do the calculation even faster. What I'm going to try and do now is to square, in my head, four two-digit numbers faster than they can do on their **___________**, even using the shortcut **______**. What I'll use is the second row this time, and I'll get four of you to each yell out a two-digit number, and if you would square the first number, and if you would square the second, the third and the fourth, I will try and **____** you to the answer. OK? So **_______**, a two-digit number please.

#### Solution

- calculators
- quickly
- method
- race
- give

#### Original Text

AB: 25. The way we can square on most calculators — let me demonstrate with this one — is by taking the number, such as five, hitting "times" and then "equals," and on most calculators that will give you the square. On some of these ancient RPN calculators, you've got an "x squared" button on it, will allow you to do the calculation even faster. What I'm going to try and do now is to square, in my head, four two-digit numbers faster than they can do on their calculators, even using the shortcut method. What I'll use is the second row this time, and I'll get four of you to each yell out a two-digit number, and if you would square the first number, and if you would square the second, the third and the fourth, I will try and race you to the answer. OK? So quickly, a two-digit number please.
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#### Important Words

- ancient
- answer
- button
- calculation
- calculators
- demonstrate
- faster
- fourth
- give
- head
- hitting
- method
- number
- numbers
- quickly
- race
- row
- rpn
- shortcut
- square
- time
- yell