The first sentence should be..

"I visit my hometown about two to three times a year"

While in the second sentence maybe grammatically incorrect

It should be "I visit my hometown twice or thrice a year

See http://dictionary.cambridge.org/de/worterbuch/englisch/twice

The first sentence should be..

"I visit my hometown about two or three times a year"

While in the second sentence maybe grammatically incorrect

It should be "I visit my hometown twice or thrice a year

See http://dictionary.cambridge.org/de/worterbuch/englisch/twice

The first sentence should be..

"I visit my hometown about two to three times a year"

While in the second sentence is grammatically incorrect

It should be "I visit my hometown twice or thrice a year

See http://dictionary.cambridge.org/de/worterbuch/englisch/twice

The first sentence should be..

"I visit my hometown about two to three times a year"

While in the second sentence maybe grammatically incorrect

It should be "I visit my hometown twice or thrice a year

See http://dictionary.cambridge.org/de/worterbuch/englisch/twice