It is 4.486
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The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1". As the answer only requires 2 significant figure then the first figure to be discarded is the units digit of 1. As this is not 5 or more then the previous figure (5) remains unchanged. 151.208 to 2 sf = 150 NOTE : Zeros are kept to show the position of the decimal point or to indicate that zero is a significant figure.
An estimate is an educated guess. Approximate and round off mean "about".
first round off the two numbers you are dividing to the nearest one. For example 9.5/1.5, round it off to 10/2 which will equal to 5.
1.0e6
The answer depends on the extent to which the number is being rounded.