adding multiplying significant figures
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Answers:Adding and subtracting After doing this thing, find the number with least decimal significant figures and round the total to that significant figures. Multiplying and dividing After doing this, find the least significant figures and round the number to that significant figures.
Answers:Each case if different. when doubt, carry an extra digit. in your example, use 3 digits are good for the entire calculation. You can round the answer to 2 if you want. Subtraction is a more difficult case, as you can subtract two similar numbers and lose significance. eg 27(10005 - 10003) if you used 2 places throughout, you would get 0 as an answer. .
Answers:the first answer should be 435 but the other two answers are correct. The answer is always the smallest amount of sig figs.
Answers:You can only be as accurate in your answer as your least accurate piece of information. In the cases you list, the answers would be 29cm, 4 x 10^1mg, 23.3cm and 1.1g/ml. If you have a 5 after the last sig fig you round to, round to the nearest even number. This way, you will be rounding up and down each about half of the time. I hope this helps.