Question

Which of the following values have 4 significant figures? Check all that apply.A. 85.3B. 50.05C. 1210D. 36.05

Answer 1

The Solution:

To determine the number of significant figures in a number use the following three (3) rules:

i. Non-zero digits are always significant.

ii. Any zeros between two significant digits are significant.

iii. A final zero or trailing zeros in the decimal portion ONLY are significant.

`85.3\text{ is 3 significant figures}`
`50.05\text{ is 4 significant figures}`
`1210\text{ is 4 significant figures}`
`36.05\text{ }is\text{ 4 significant figures}`

Thus, the numbers: 50.05, 1210 and 36.05 have 4 significant figures.

Therefore, the correct answers are: option B, option C and option D