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Here's exactly what PEMDAS means for solving math problems: Parentheses: Anything in parentheses must be simplified first. Exponents: Anything with an exponent (or square root) must be simplified after everything in parentheses has been simplified.
- What's A Doomsday, though?
- The Algorithm
- Takeaway Thoughts
The "Doomsday" of the "Doomsday rule" is not about the end of the world. Every year has so called Doomsdays. A Doomsday is a day whose weekday is known. For every year the Doomsdays have the same weekday. For example: If you know that the November 7th (a Doomsday) was a Saturday - which weekday is November 21st? You know that there's 14 days in bet...
The Doomsday rule takes advantage of the fact that patterns in calendars repeat every so often. Here's a basic diagram of what the algorithm is actually doing: It basically narrows down the weekday by first looking at the century given, then the year, then the month and finally pinponting the exact date. Let's go through it step-by-step. We'll try ...
When I first heard about the Doomsday rule, I was baffled. It took me quite some time (and calculating) to understand it, but once I got it, I was amazed by its cleverness. The algorithm isn't too costly either, because it only uses algebra. With some more memory hooks (especially memorizing Doomsdays and anchor days for several years) one can calc...
When advancing a century from a century you know the Doomsday for, go back two days, unless the new century is divisible by 400, in which case only go back one day. Use the anchor day for the century to calculate the doomsday for the year. Century Day: Tuesday = 1600, 2000,...
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Conway’s Doomsday Rule The rule referred to is a calculational procedure or mnemonic for determining the day of the week from the date. For simplicity we restrict ourselves to the 20th and 21st centuries, although one can also apply the method to earlier times. We associate each day of the week with one of the numbers 0 through 6, as follows ...
PEMDAS is a mnemonic device that can help us remember the order of operations which we already know stands for “Please Excuse My Dear Aunt Sally”. P – Parentheses. E – Exponents. M – Multiplication. D – Division. A – Addition. S – Subtraction. Just a quick caution, the operations of multiplication and division have the same ...
Operations. "Operations" mean things like add, subtract, multiply, divide, squaring, etc. If it isn't a number it is probably an operation. But, when you see something like ... 7 + (6 × 5 2 + 3)
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PEMDAS is an acronym that stands for "Please excuse my dear aunt Sally," which is a mnemonic device intended to help with memorizing the order of operations.
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