Question

How do you add `4.77 x 10^4` and `8.62 x 10^5`?

Answer 1

You first take them to the same `10`-power

`4.77*10^4=0.477*10^5`

Now you can add:

`0.477*10^5+8.62*10^5=`
`(0.477+8.62)*10^5=`
`9.097*10^5~~9.10*10^5`
(rounded to three significant digits)