Question

How do you add `1.26 x 10^4 +2.5 x 10^3`?

Answer 1

You first bring both numbers to the same `10`power

`2.5*10^3=0.25*10^4`
because you move the decimal point to the left `10`power goes up .

Now add the numbers:
`1.26*10^4+0.25*10^4`
`=(1.26+0.25)*10^4=1.51*10^4`