How much?
(price, not quantity)
Magkano ito?
How much is this?

Magkano iyan?
How much is that?

Magkano daw?
How much did she say it was?

Iyan ba ang pinakamura?
Is that the cheapest one?

Tanungin mo kung magkano.
Ask how much it is.

Tinanong ko kung magkano.
I asked how much.

Tinanong mo ba kung magkano?
Did you ask how much it was?

To ask how to do something, use the word paano.

To ask the amount of something, use gaano.

To ask how many, use ilan.