Geodesic
A Broader way Through Themas of Elementary School Mathematics, vii
The Teaching of Mathematics, VII (2004) no. 2, p. 71 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

An extension of the block of numbers 1--100 to the block of numbers 1--1000 is considered. The reason for singling out this block is a thorough elaboration of the procedures of decimalization. Represented as sums of hundreds and one- or two-digit numbers, addition and subtraction of three-digit numbers is reduced to easy and already known cases of performing these operations. Represented as sums of units, tens and hundreds, these two operations are also carried out on such summands. To the latter case, the shorthand forms of performing these operations on digits, are attached. Bound to the cases of one-digit multipliers or divisors, multiplication and division are treated similarly. By analogy, these acquired skills and understanding are expected to be carried over in cases of all other numbers, when operations are chiefly performed on digits. At the end, we summarize main points of our approach to the elaboration of arithmetic, being exposed in all seven parts of this paper that run under the same title.
Classification : 00A35 F32
Keywords: Block of numbers 1--1000, Decimalization. 
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Milosav M. Marjanović. A Broader way Through Themas of Elementary School Mathematics, vii. The Teaching of Mathematics, VII (2004) no. 2, p. 71 . http://geodesic.mathdoc.fr/item/TM2_2004_VII_2_a1/