Answer
$2,400 = 2.4 \times 10^3$
Work Step by Step
Move the decimal point until the number is between 1 and 10.
$2,400. $ -> $2.400$
The decimal point is moved 3 places and the original number is 10 or greater, so the count is positive 3.
$2,400 = 2.4 \times 10^3$