Final answer:
To write the number 'Two and eighteen ten-thousandths' as a decimal, you need to place the decimal point after the fourth digit and write the whole number part followed by the fractional part, which is 2.0018.
Step-by-step explanation:
To write the number 'Two and eighteen ten-thousandths' as a decimal, we need to consider the place value of each digit. The number 'Two' represents the whole number part, which is 2. The number 'eighteen' represents the fractional part, which is 18 in this case. Since it is 'ten-thousandths', the decimal point needs to be placed after the fourth digit. Writing it in decimal form, we get 2.0018.