Significant Digits
Significant Digits
• Non-zero numbers are always significant.
• Zeros after a decimal are always significant.
• Zeros between significant digits are always significant.
• Zeros used for holding space are not significant.
Quiz
0.001 = 1
0.0500 = 3
200 = 1
605 = 3
1010 = 3
1010. = 5
Operations with Significant Digits
• Adding and subtracting
The answer is only as precise as the least precise digit in one of the addends.
• Multiplying and Dividing
The answer should have the same amount of significant digits as the number in the problem with the least number of significant digits.
• Examples:
45.6 – 12.47 = 33.1
18 + 6.884 = 25
5.8003 x 7.46 = 43.3
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