Final answer:
The number 5.316 is written in word form as 'five point three one six.' Each digit after the decimal is read individually.
Step-by-step explanation:
The number 5.316 in word form is 'five point three one six.'
When expressing the number in words, you essentially read it as it appears, with 'point' indicating the decimal place. Each digit following the decimal point is read individually. In this case, after the decimal, you have 'three,' 'one,' and 'six.'