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- https://math.libretexts.org/Bookshelves/Applied_Mathematics/Understanding_Elementary_Mathematics_(Harland)/03%3A_______Addition_and_Subtraction/3.03%3A_Addition_AlgorithmsThe unit's digit is put down under the line and the ten's digit is carried to the top of the next column to the left. In the Left to Right Algorithm, anytime a 9 is underlined, you must continue the u...The unit's digit is put down under the line and the ten's digit is carried to the top of the next column to the left. In the Left to Right Algorithm, anytime a 9 is underlined, you must continue the underline to include the digit to the left of the nine (if there is a digit to its left).
- https://math.libretexts.org/Courses/Coastline_College/Math_C104%3A_Mathematics_for_Elementary_Teachers_(Tran)/04%3A_______Addition_and_Subtraction/4.03%3A_Addition_AlgorithmsThe unit's digit is put down under the line and the ten's digit is carried to the top of the next column to the left. In the Left to Right Algorithm, anytime a 9 is underlined, you must continue the u...The unit's digit is put down under the line and the ten's digit is carried to the top of the next column to the left. In the Left to Right Algorithm, anytime a 9 is underlined, you must continue the underline to include the digit to the left of the nine (if there is a digit to its left).
- https://math.libretexts.org/Courses/Hartnell_College/Mathematics_for_Elementary_Teachers/04%3A_______Addition_and_Subtraction/4.03%3A_Addition_AlgorithmsThe unit's digit is put down under the line and the ten's digit is carried to the top of the next column to the left. In the Left to Right Algorithm, anytime a 9 is underlined, you must continue the u...The unit's digit is put down under the line and the ten's digit is carried to the top of the next column to the left. In the Left to Right Algorithm, anytime a 9 is underlined, you must continue the underline to include the digit to the left of the nine (if there is a digit to its left).