# How do you write and simplify 2.5 times 10^4+ 3.75times 10^5 in scientific notation?

$4.00 \times {10}^{5}$
$3.75 \times {10}^{5}$ = 375000
$2.5 \times {10}^{4}$ = 25000 adding this gives
$400000 = 4.00 \times {10}^{5}$