Mexicana statements are in kilometers, but conversion rates are in miles.

1 mile = 1.6km
3,125 miles = 10,000 HHonors points
3,125 miles = 5,000 km

So you need to transfer 3,125 miles (5,000km) to get 10,000 HHonors points.

Now, how to do it: As stated in a post above, if you call Frequenta and ask to transfer the bonus miles, they won't. Their policy is that bonus miles can't be transferred out. However, if you make the same request to this e-mail:
[email protected]
the miles will transfer.

Why this is, I don't know. In the e-mail, simply ask to deduct 5,000km from your account and transfer 10,000 HHonors points. You need to include your name, phone number, and account numbers. I have made transfers without including a Frecuenta pin.

Hope this helps.