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2. Free Online Games: Play board games, card games, casino games ...

   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

3. Basic Math (video game) - Wikipedia

   en.wikipedia.org/wiki/Basic_Math_(video_game)

   The player controls the line under the zero to manipulate the numbers for the answer. In Basic Math, each game features 10 rounds of arithmetic problems involving either addition, subtraction, multiplication, or division. [3] [4] The player moves the joystick to cycle through numbers zero through nine to fill in number prompts. The player ...

4. Bulls and cows - Wikipedia

   en.wikipedia.org/wiki/Bulls_and_Cows

   The game play for the word version is as follows. One player (the host) thinks of an isogram word (i.e. no letter appears twice) and, if the word length is not pre-determined, announces the number of letters in the word. Other players (the guessers) try to figure out that word by guessing isogram words containing the same number of letters.

5. Mental calculation - Wikipedia

   en.wikipedia.org/wiki/Mental_calculation

   It is an in-person competition that occurs every other year in Germany. It consists of four different standard tasks --- addition of ten ten-digit numbers, multiplication of two eight-digit numbers, calculation of square roots, and calculation of weekdays for given dates --- in addition to a variety of "surprise" tasks. [4]

6. Carry (arithmetic) - Wikipedia

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

   They face two basic difficulties: The first one stems from the fact that a carry can require several digits to change: in order to add 1 to 999, the machine has to increment 4 different digits. Another challenge is the fact that the carry can "develop" before the next digit finished the addition operation.

7. Stepped reckoner - Wikipedia

   en.wikipedia.org/wiki/Stepped_reckoner

   The input section is moved with the end crank until the lefthand digits of the two numbers line up. The operation crank is turned and the divisor is subtracted from the accumulator repeatedly until the left hand (most significant) digit of the result is 0.if it shows any other number, that is the remainder. [citation needed]. The number showing ...