Mastering Significant Digits

What are significant digits used for in mathematics and science?

• To express the precision and accuracy of measurements

• To calculate the average of numbers

• To convert units of measurement

• To solve algebraic equations

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Understanding

Which of the following numbers has 5 significant digits?

• 123.45

• 0.0045

• 230.0

• 10,000

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Remembering

Significant digits include all non-zero digits and any zeros that are between non-zero digits or at the ___ of the number.

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When using exponential notation, which digits are considered significant?

• All non-zero digits and zeros between them

• Only the first non-zero digit

• Only trailing zeros

• All zeros

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In the number 4.0070, how many significant digits are there?

• 5

• 3

• 4

• 6

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