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2. Verbal arithmetic - Wikipedia

   en.wikipedia.org/wiki/Verbal_arithmetic

   Verbal arithmetic, also known as alphametics, cryptarithmetic, cryptarithm or word addition, is a type of mathematical game consisting of a mathematical equation among unknown numbers, whose digits are represented by letters of the alphabet. The goal is to identify the value of each letter.

3. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   Download as PDF; Printable version ... system is the fluent recall or derivation of the 100 single-digit "addition ... word problems may help rationalize the ...

4. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   This is known as the commutative property of addition. (a + b) and (b + a) produce the same output. [7] [8] The sum of two numbers is unique; there is only one correct answer for a sums. [8] When the sum of a pair of digits results in a two-digit number, the "tens" digit is referred to as the "carry digit". [9]

5. Hundred-dollar, Hundred-digit Challenge problems - Wikipedia

   en.wikipedia.org/wiki/Hundred-dollar,_Hundred...

   The Hundred-dollar, Hundred-digit Challenge problems are 10 problems in numerical mathematics published in 2002 by Nick Trefethen . A $100 prize was offered to whoever produced the most accurate solutions, measured up to 10 significant digits. The deadline for the contest was May 20, 2002.

6. Carry (arithmetic) - Wikipedia

   en.wikipedia.org/wiki/Carry_(arithmetic)

   A typical example of carry is in the following pencil-and-paper addition: 1 27 + 59 ---- 86 7 + 9 = 16, and the digit 1 is the carry. The opposite is a borrow, as in −1 47 − 19 ---- 28 Here, 7 − 9 = −2, so try (10 − 9) + 7 = 8, and the 10 is got by taking ("borrowing") 1 from the next digit to the left. There are two ways in which ...

7. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   Starting from the rightmost digit, each pair of digits is added together. The rightmost digit of the sum is written below them. If the sum is a two-digit number then the leftmost digit, called the "carry", is added to the next pair of digits to the left. This process is repeated until all digits have been added. [65]

8. Waring's problem - Wikipedia

   en.wikipedia.org/wiki/Waring's_problem

   In number theory, Waring's problem asks whether each natural number k has an associated positive integer s such that every natural number is the sum of at most s natural numbers raised to the power k. For example, every natural number is the sum of at most 4 squares, 9 cubes, or 19 fourth powers.

9. Longest word in English - Wikipedia

   en.wikipedia.org/wiki/Longest_word_in_English

   The longest single palindromic word in English is rotavator, another name for a rotary tiller for breaking and aerating soil. Typed words The longest words typable with only the left hand using conventional hand placement on a QWERTY keyboard are tesseradecades , aftercataracts , dereverberated , dereverberates [ 33 ] and the more common but ...