numeric constants

Getting Started Newbie Questions
#1

What all these numeric constants mean

4.57e-3

0.3e12

5e+20

thank

#2

“e” sign means how much of the zeroes in this number. For example 4.57e-3 is equivalent to 4.57 * 10^-3 or 0,00457. 0.3e12 - is 0.3 * 10^12 or 300000000000 (use calculator to handle this out)

#3

thank for help

#4

“e” sign means how much of the zeroes in this number. For example 4.57e-3 is equivalent to 4.57 * 10^-3 or 0,00457. 0.3e12 - is 0.3 * 10^12 or 300000000000 (use calculator to handle this out)

#5

thank for help