But articles in these two languages work differently from English articles. (And of course from each other.)
English articles do not have gender, nor are they attached to adjectives. The English indefinite article is singular. To express indefiniteness about a pair, a number of things, or an amount, we often need to use the adjective some or perhaps a lot of or other classifier phrases like pieces of.
Spanish has a tidy, logical system: definite and indefinite articles decline for number and gender. Unos and unas are great.