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Least Common DenominatorThe Least Common Denominator (also called the Lowest Common Denominator, LCD) is the smallest number which is a multiple of two or more (numbers in the) denominators. The LCD is a special case of the Least Common Multiple concept Wow! Who did understand anything? But wait! Don't you see? We are talking about fractions! So what did we say when writing about adding fractions? That units matters and that you cannot add apples with oranges. The LCD allows us to add fractions because we can work out a common ground for our arithmetical operation! All apples! You can also consider this exercise to understand the concept. 2. The jewels in a crown (ratio problem) from my fraction worksheets webpage.
605. The student should read his author with the most sus TODHUNTER, ISAAC. Source: Memorabilia mathematica; or, The philomath's quotationbook  Moritz, Robert Édouard, 18681940
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