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2. Worksheet - Wikipedia

   en.wikipedia.org/wiki/Worksheet

   In accounting, a worksheet is, or was, a sheet of ruled paper with rows and columns on which an accountant could record information or perform calculations. These are often called columnar pads, and typically green-tinted. In computing, spreadsheet software presents, on a computer monitor, a user interface that resembles one or more paper ...

3. Numeral prefix - Wikipedia

   en.wikipedia.org/wiki/Numeral_prefix

   Numeral or number prefixes are prefixes derived from numerals or occasionally other numbers. In English and many other languages, they are used to coin numerous series of words. For example: simplex, duplex (communication in only 1 direction at a time, in 2 directions simultaneously) unicycle, bicycle, tricycle (vehicle with 1 wheel, 2 wheels ...

4. List of numbers - Wikipedia, the free encyclopedia

   en.wikipedia.org/wiki/List_of_numbers

   A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

5. Penmanship - Wikipedia

   en.wikipedia.org/wiki/Penmanship

   A thin object (pen), held with three fingers, allows you to draw thin lines. Penmanship is the technique of writing with the hand using a writing instrument. Today, this is most commonly done with a pen, or pencil, but throughout history has included many different implements.

6. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem , there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes .

7. 50 (number) - Wikipedia

   en.wikipedia.org/wiki/50_(number)

   In mathematics. Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 1 2 + 7 2 = 5 2 + 5 2 (the former is the sum of squares of divisors of 7 ). [ 1] It is also the sum of three squares, 50 = 3 2 + 4 2 + 5 2 (that feature in the smallest Pythagorean triple ), and the sum of four squares, 50 = 6 ...