How would i calculate

Question

2.34 mg x 10^6 divided by 3.50 kg

Answer 1

punch in 2.34E-6, hit the divide button, and punch in 3.5. Hit the enter button.

Answer 2

But i get 0.0017

Answer 3

If the problem is
2.34E-6/3.5 = then the answer is
6.68571E-7

Answer 4

If the problem is 2.34 mg in 3.5 kg and convert to ppm, that is
2.34/3.5 = 0.666 ppm