Round each decimal to the nearest thousandth. (a) 0.8 (line above 8) (b) 0.4 (line above 4) (c) 0.9762 (d) 0.8645

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Understand that rounding to the nearest thousandth means keeping three digits after the decimal point and deciding whether to round the last digit up or keep it the same based on the digit immediately after it.

For each decimal, identify the digit in the thousandths place (the third digit after the decimal point). If the number has fewer than three digits after the decimal, consider adding zeros to reach the thousandths place.

Look at the digit immediately to the right of the thousandths place (the fourth digit after the decimal). If this digit is 5 or greater, increase the thousandths digit by 1; if it is less than 5, leave the thousandths digit as is.

Apply this rule to each decimal: (a) 0.8 (with a repeating 8), (b) 0.4 (with a repeating 4), (c) 0.9762, and (d) 0.8645, carefully determining the thousandths digit and the next digit to decide rounding.

Write the rounded number for each part, ensuring the result has exactly three digits after the decimal point.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Place Value and Decimal Notation

Understanding place value is essential for rounding decimals. Each digit in a decimal number has a specific place, such as tenths, hundredths, and thousandths. Recognizing these positions helps determine which digit to round to and which digit influences the rounding.

Rounding Rules for Decimals

Rounding decimals involves looking at the digit immediately to the right of the target place value. If this digit is 5 or greater, increase the target digit by one; if less than 5, keep the target digit the same. This process simplifies numbers while maintaining approximate value.

Interpreting Repeating Decimals

Repeating decimals have one or more digits that repeat infinitely, indicated by a line over the digit(s). When rounding, it’s important to consider the repeating pattern as it affects the digit following the rounding place, ensuring accurate approximation to the desired decimal place.

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