At the weekends versus on the weekends

[Salman]

English Grammar Tests, Elementary Level

ESL/EFL Test #43 "Basic English Grammar", question 2

......... do you like to do on the weekends?

(a) How
(b) What
(c) Who
(d) Where

English Grammar Tests, Elementary Level

ESL/EFL Test #43 "Basic English Grammar", answer 2

What do you like to do on the weekends?

Correct answer: (b) What
_________________________

Isn't it "at the weekends"? In the test question it says "on the weekends".

Salman

[Conchita]

Both expressions are correct.

'On the weekend' is common in American usage.