What are the haploid numbers for the fern and onion plants?

The diploid number of the fern and onion plants are

fern: 1010

onion plant: 16

The formula of the diploid is 2N where N represents the haploid number.

Diploid = 2N;

fern:

1010 = 2N

1010/2 = N

505 = N;

onion plant:

16 = 2N

16/2 = N

8 = N

The haploid number for the fern is 505 and the haploid number for the onion plant is 8.