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. "6 Developing Proficiency with Whole Numbers." Adding It Up: Helping Children Learn Mathematics. Washington, DC: The National Academies Press, 2001.
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Box 6–7 Three Methods for Muitidigit Addition
A Common U.S. Algorithm
right to left
add, carry to left
add carry to top number, remember new number while adding it to bottom number
Accessible Generalizable Methods
carry goes below in answer space, keeping total together
add 2 numbers you see, then increase that number by 1 for previous carry
can be done in either direction
add each kind of unit first, then add those totals