High School Placement Test Prep

Answer: D - There are only ten digits in the decimal system: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. Digits are simply the characters used to express numbers. They do not have value in and of themselves - the combination of a digit and place value determine the value of a number. Notations and signs, like a negative sign (-), can also affect a number's value. For example, '7', '5' and '0' are the digits of 750. The '7' represents '700' because the digit is in the hundreds place, while the '5' represents '50' because the digit is in the tens place.