How Many Threes?

Riddle: Jenna wrote all the numbers from 300 to 400 on a piece of paper. How many times did she write the digit 3?

Answer: Jenna wrote it 120 times.

Source: https://www.riddles.com/index.php/379

Jenna wrote all the numbers from 300 to 400 on a piece of paper. How many times did she write the digit 3? — How Many Threes? by Anonymous v1.

Riddle: Jenna wrote all the numbers from 300 to 400 on a piece of paper. How many times did she write the digit 3? Answer: Jenna wrote it 120 times. — by Anonymous v2.