chrismachine wrote:Saltine wrote:It's scientific notation. One reason to do this is that it gives a clearer idea of the uncertainty of the number. "1×10¹" gives a little more information than "10¹", since it has one significant figure and means "anywhere between 5 and 15". Compare this to "1.0×10¹", which has two significant figures and means "anywhere between 9.5 and 10.5".

how can you multiply 1×10¹ and have it mean 15?

(Sorry Skimba)

Because the nearest number you can accurately have without rounding to 20 is ~15, since the accuracy is to the ones place and not any more accurate. For example, it could be 14.999999999 x 10¹, but due to the accuracy of the ones place, it still rounds down to 10.

I'm guessing you're not a math/science teacher at the school?