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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. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Starting from the rightmost digit, double each digit and add the neighbor. (The "neighbor" is the digit on the right.) If the answer is greater than a single digit, simply carry over the extra digit (which will be a 1 or 2) to the next operation. The remaining digit is one digit of the final result. Example:

4. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   Addition (usually signified by the plus symbol +) is one of the four basic operations of arithmetic, the other three being subtraction, multiplication and division. [2] The addition of two whole numbers results in the total amount or sum of those values combined. The example in the adjacent image shows two columns of three apples and two apples ...

5. Number bond - Wikipedia

   en.wikipedia.org/wiki/Number_bond

   A child who "knows" this number bond should be able to immediately fill in any one of these three numbers if it were missing, given the other two, without having to "work it out". Number bonds are often learned in sets for which the sum is a common round number such as 10 or 20. Having acquired some familiar number bonds, children should also ...

6. Nihilist cipher - Wikipedia

   en.wikipedia.org/wiki/Nihilist_cipher

   An additional weakness is that the use of normal addition (instead of modular addition) leaks further information. For example, (assuming a 5 × 5 square) if a ciphertext number is greater than 100 then it is a certainty that both the plaintext and key came from the fifth row of the table.

7. Paid biweekly? Here's when you could get an 'extra' paycheck ...

   www.aol.com/paid-biweekly-heres-could-extra...

   Employees who get paid on a biweekly basis (every other week) can expect two months with a third paycheck in 2025. These months depend on when the first paycheck of the year is.