It is: 3.4 minus 38.736 = -35.336
When using significant digits, the product has only the number of significant digits as the lowest number in the factors. "20" has two significant digits and "310" has three. Therefore, the product has to have two significant digits. 310 × 20 = 6200 6200 already has two significant digits.
3.5g
Significant digits, or significant figures, reflect the precision of a measurement and convey the reliability of the data. When performing calculations with measurements, the number of significant digits in the result should be determined by the measurement with the least number of significant digits. This practice ensures that the final answer accurately represents the precision of the input data, preventing false precision and maintaining the integrity of the calculations.
17.0303
It isn't clear what the question is. If you are supposed to multiply or divide, and if by "signification figures" you mean significant digits, do the multiplication (or division), then round to three significant digits - since the least-precise of the numbers only has three significant digits.
Adding numbers using only the significant digits can introduce inaccuracies, for example if you are adding pi ten times using 4 decimal places of pi the answer is 31.416 but the right answer is 31.4159 . . Subtracting can give quite bad errors especially when two nearly equal numbers are subtracted. So for subtraction it's best to use more significant figures and round the answer to the required number of digits afterwards.
12.7
Significant digits, or significant figures, are crucial in scientific and mathematical calculations as they convey the precision of a measurement. They indicate which digits in a number are reliable and contribute to its accuracy, helping to prevent the misinterpretation of data. Using the correct number of significant digits ensures that results reflect the limitations of the measuring instruments and maintains consistency in reporting numerical values. This practice is essential for clear communication and credibility in scientific research and engineering.
4,777 km
The product is 11 mm
their both based on units of measure
4.0 x 10-2 * 8.1 x 102 = 32.4 2 significant digits, so the answer is 32.