The number ninety can have specific meanings in different cultures, often symbolizing completion or fullness. In China, the character for 'ninety' looks like the word for 'everlasting'.
Pro Tip 2/3
Common Fractions
Ninety is often used with percentages; to mean nine out of every ten parts. The teacher said ninety percent of the class passed the exam.
Pro Tip 3/3
Round Number
People use round numbers like ninety to estimate or simplify counts, rather than exact figures. There were about ninety people at the concert last night.