Question

Order 34 × 102, 1.2 × 107, 8.11 × 10–3 and 435 from least to greatest.

Answer 1

I will assume that this question is about scientific notation (also assuming that the first number is 3.4*10^2), where you can arrange the numbers by the exponent of the 10, so from least to greatest:
$8.11*10^{-3}$, $3.4*10^{2}$, 435, and $1.2*10^{7}$