Finding Thousandths in 2.351: Decimal Place Value Practice

To solve this problem, let's identify the place value of each digit in the decimal number 2.351:

• The first digit to the right of the decimal point (3) is in the tenths place.
• The second digit (5) is in the hundredths place.
• The third digit (1) is in the thousandths place.

Since we are asked to determine the number of thousandths, we focus on the last digit, which is 1. This digit represents the thousandths in the number 2.351.

Therefore, the number of thousandths in 2.351 is $1$.