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2. Basic Math (video game) - Wikipedia

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

   The right difficulty switch functions on whether or not there will be a timer in the game. The left difficulty switch changes whether the player has 12 or 24 seconds in the first four game modes. In the other four game modes, the player has either two-digit problems with a 24 second time limit or single digit problems with a 12 second time ...

3. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Example of addition with carry. The black numbers are the addends, the green number is the carry, and the blue number is the sum. In the rightmost digit, the addition of 9 and 7 is 16, carrying 1 into the next pair of the digit to the left, making its addition 1 + 5 + 2 = 8. Therefore, 59 + 27 = 86.

4. 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 ...

5. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   If this number is truncated to 4 decimal places, the result is 3.141. Rounding is a similar process in which the last preserved digit is increased by one if the next digit is 5 or greater but remains the same if the next digit is less than 5, so that the rounded number is the best approximation of a given precision for the original number.

6. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   The prerequisite to addition in the decimal system is the fluent recall or derivation of the 100 single-digit "addition facts". One could memorize all the facts by rote, but pattern-based strategies are more enlightening and, for most people, more efficient: [36]

7. Digital sum - Wikipedia

   en.wikipedia.org/wiki/Digital_sum

   The digit sum - add the digits of the representation of a number in a given base. For example, considering 84001 in base 10 the digit sum would be 8 + 4 + 0 + 0 + 1 = 13. The digital root - repeatedly apply the digit sum operation to the representation of a number in a given base until the outcome is a single digit. For example, considering ...