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M5.1.1 - Round and estimate using whole numbers and decimals
M5.1.1 - Round and estimate using whole numbers and decimals

... To round a number:  Find the place to which you want to round the number  Look at the number to the right - If that number is 0 through 4, the place you want to round to stays the same. If the number is 5 through 9, the place you want to round to will go up.  Copy the number exactly as it is to t ...
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< 1 ... 335 336 337 338 339 340 341 342 343 ... 351 >

Positional notation

Positional notation or place-value notation is a method of representing or encoding numbers. Positional notation is distinguished from other notations (such as Roman numerals) for its use of the same symbol for the different orders of magnitude (for example, the ""ones place"", ""tens place"", ""hundreds place""). This greatly simplified arithmetic leading to the rapid spread of the notation across the world.With the use of a radix point (decimal point in base-10), the notation can be extended to include fractions and the numeric expansions of real numbers. The Babylonian numeral system, base-60, was the first positional system developed, and is still used today to count time and angles. The Hindu–Arabic numeral system, base-10, is the most commonly used system in the world today for most calculations.
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