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# What is an estimated digit?

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The last digit in any number is referred to as the estimated digit. In science, all other numbers are considered significant digits because they are precise measurements.

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The last number in a measurement in science is simply an estimation. For example, if a metal rod measures slightly over 234 inches, the final measurement can be rounded so the answer is 234 instead of 234.2. The more significant numbers a digit has, the more precise the measurement. A significant number includes all non-zero numbers, all zeros that fall between two significant digits and all zeros that are to the right of a decimal point or to the right of a non-zero number.

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## Related Questions

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The two numbers that have a tens digit that is eight more than the ones digit are 80 and 91. Note that there are some larger numbers that also exhibit this pattern, such as 180, 280, 191 or 291.

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A nonzero digit is a numerical digit that is not equal to zero. A digit is a numerical symbol that represents an integer from 0 to 9, so a nonzero digit is any digit from 1 to 9.

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To write a number in expanded form, break apart a number, and write it as the sum of each place value. For example, 8324 = 8000 + 300 + 20 + 4. Decimals may also be expanded in a similar format: 0.239 = 0.2 + 0.03 + 0.009.