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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.
Use these rules when recording measurements and rounding calculations in chemistry. Write all the digits you are sure of, plus the first digit that you must estimate in the measurement – the first doubtful digit (the first uncertain digit). Then stop. When writing a measurement in significant figures, the last digit is the first doubtful digit.
Printable PDF: Allows teachers to use the same problems for whole class learning, or Review later. It makes rounding accurate, not random! Students see this as a meaningful skill for interpreting & communicating calculated results.
Round this number to 2 signi+icant +igures. Question 3: Round the following numbers to 1 signi+icant +igure (a) eight million, six hundred thousand (b) the product of 19 and 351 Question 4: Tom has been asked to round the number on the calculator to 2 signi+icant igures. Tom says the answer is 516.16 Can you explain Tom’s mistake?
Significant Figures Worksheet Key 1. Indicate how many significant figures there are in each of the following measured values. 246.32 5 sig figs 107.854 6 sig figs 100.3 4 sig figs 0.678 3 sig figs 1.008 4 sig figs 0.00340 3 sig figs 14.600 5 sig figs 0.0001 1 sig fig 700000 1 sig fig 350.670 6 sig figs
Following the old rules, you can round a number down in value four times (rounding with one, two, three, four) compared to rounding it upwards five times (five, six, seven, eight, nine).
1) Round the numbers in the table. Number Nearest 10 Nearest 100 423 420 482 535 799 [1] 2) Round the numbers in the table. Number Nearest unit Nearest tenth 3.41 3 7.27 1.82 7.95 [1] 3) Round the numbers in the table. Number 1 decimal place 2 decimal places 0.474 0.5 4.945 0.6138 88.7057 [1] Rounding, Decimal Places and Significant Figures ...
