Search results
Rules for rounding off numbers (1) If the digit to be dropped is greater than 5, the last retained digit is increased by one. For example, 12.6 is rounded to 13. (2) If the digit to be dropped is less than 5, the last remaining digit is left as it is. For example, 12.4 is rounded to 12.
11 paź 2023 · A significant figure is each digit in a number that helps to express the number with the required degree of accuracy. For example, the number 15.6 has three significant figures. There are specific rules for deciding the number of significant figures.
• Significant figures: digits in the number that are reliable and absolutely necessary to indicate the quantity of something (Wikipedia). • Number of significant digits depends on the precision of the analytical method • More significant figures do not give more information on accuracy
SIGNIFICANT FIGURES. The amount of approximation required in a number may be described in another way by saying how many significant figures are required. To find how many significant figures a number contains count all figures in the number except zeros at the beginning or end of the number.
Significant Figures and Rounding – Explanations and Examples Read pages 18-22 in your Lab Manual for a more thorough discussion of the meaning of significant figures and how it relates to accuracy, precision, and error.
Although there are slight variations in the rules, the general rules for rounding off are as follows: 1) If the first digit after the last significant figure is less than 5, round down. 2) If the first digit after the last significant figure is greater than 5, round up.
The number of significant places tell us where to start rounding, from then on the rules are the same. Examples. Rounding to 2 significant figures: 15,420 becomes 15,000 (the 1 and the 5 are the first two significant figures and the next digit, 4, is less than 5) 0.001586 becomes 0.0016.
