In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Stroke is our nation's number _ killer, and a leading cause of disability for older adults.
[A]: three


[Q]: House wrens are small birds, four and a half to _ and a four inches in length.
[A]: five


[Q]: Preeclampsia occurs without warning in up to _ percent of all pregnant women.
[A]:
five