Because, for example, nobody is interested in the fact that their height is 1.472811689806 metres approximately.
There are no set rules about rounding numbers, so when rounding numbers, mathematical rules about rounding can be used. For example, 14 would be rounded to 10, but 15 would be rounded to 20. For another example, 1144 is rounded to 1140 and 1145 is rounded to 1150.
1.0348m rounded to 4 significant numbers is 1.035m
There are no "these" numbers. 1456400, rounded to the nearest thousand is 1456000
98600
Ten integers can be rounded off to 280. An infinite number of numbers can be rounded off to 280.
1000
Infinitely many numbers.1 million and 1 whole numbers . Although, technically 34 million, itself, would not be rounded. This would comprise the numbers from [33,500,000, 34,500,000]. In the first case the 5 is rounded up while in the second it is rounded down. This is consistent with the rule of "Round up or down so that the new last digit is even". This is the default rounding mode used in IEEE 754 computing functions and operators.
Numbers can be rounded to 400 if they fall within the range of 350 to 449. This range includes all numbers from 350.5 to 449.49, as they would round up to 400. Therefore, there are 100 numbers that can be rounded to 400.
Ten whole numbers can be rounded to 30. The numbers are 25, 26, 27, 28, 29, 30, 31, 32, 33 and 34. There are an infinite number of complex numbers in the interval [25,35) that can be rounded to 30.
There are two types of significant figures, measured and exact. Numbers are often rounded to avoid reporting insignificant figures. Numbers can also be rounded merely for simplicity rather than to indicate a given precision of measurement.
Since numbers equal to or greater than 5 are rounded up, and numbers equal to or less than 4 are rounded down, the largest 4-digit number that can be rounded off to 3000 would be 3004.
Irrational numbers are used in some scientific jobs. Commonly used irrational numbers are pi, e, and square roots of different numbers. Of course, if an actual numerical result has to be calculated, the irrational number is rounded to some rational (usually decimal) approximation.