Final answer:
The different way to write 1.66666666667 is 1.66667. Hence the correct answer is option B
Step-by-step explanation:
The different way to write the number 1.66666666667 is option B) 1.66667. This is because we are asked to write the number with a limited number of decimal places, and 1.66667 rounds the number to the nearest hundred thousandth.