When you multiply decimals by integers (whole numbers), you can use everything you already know about multiplying multi-digit numbers. You can use written or mental methods to multiply decimals by ...
A mathematical proof is a sequence of statements that follow on logically from each other that shows that something is always true. Using letters to stand for numbers means that we can make statements ...
The original version of this story appeared in Quanta Magazine. Mathematics started with numbers—clear, concrete, intuitive. Over the last two centuries, however, it has become a far more abstract ...
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