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Rules for rounding off numbers. 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. 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.
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.
There are three rules on determining how many significant figures are in a number: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant. Focus on these rules and learn them well.
Scientific notation, significant figures and rounding . Scientific or Standard Notation is best used to express very large or very small numbers in a compact, easy to read form, but can be used on any numbers. Simply, the basic format of the notation is + n-> a positive index indicates a large number. a 10× n
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.
Here you will find a range of free printable rounding worksheets to help your child learn to round numbers to either 1,2 or 3 significant figures. These sheets are carefully graded so that the easier sheets come first and give extra support.
There are special sig fig rules for rounding off a 5, zeros, and exact numbers. 1. Rounding. If the number beyond the place you are rounding to is a. Less than 5: Drop it (round down). Example: 1.342 rounded to tenths = 1.3 b. Greater than 5: Round up. Example: 1.48 = 1.5 c. A 5 followed by other digits: Round up. Example: 1.252 = 1.3
