Excerpt - page 22: "... is covered by the theorems which follow. The rule for lowestcommonmultiples is to be that we multiply together all visibly different ..."
Excerpt - page 509: "... MATHEMATICAL DERIVATIONS Addition and subtraction of common fractions Each of the fractions to be added or subtracted must be converted to the same lowestcommon denominator , LCD (the lowestcommonmultiple of the individual denominators). Rule C "To add or subtract ..."
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Excerpt - page 168: "... (laving reduced the fractions to their lowest terms, we find the least commonmultiple of the numerators, 1, 3, and 21, to be 21. ..."