Answer:
During the ’80s, the world’s economy grew.
During the 1980s, the world’s economy grew.
During the 1980’s, the world’s economy grew.
Not Advised:
During the ’80’s, the world’s economy grew.
Rule: Some writers spell out the time of day, others prefer numbers.
Example: She gets up at four thirty before the baby wakes up.
Example: The baby wakes up at 5 o’clock in the morning.
Rule: Some use numerals with the time of day when exact times are being emphasized.
Example: Her flight leaves at 6:22 a.m.
Example: Please arrive by 12:30 p.m. sharp.
Rule: It is clearer to use noon and midnight rather than 12:00 p.m. or 12:00 a.m.
Note: You may use AM and PM, A.M. and P.M., am and pm, or a.m. and p.m.
Some put a space after the numeral, others do not.
Example: Her flight leaves at 6:22 a.m.
Example: Her flight leaves at 6:22am.
Example: Please arrive by 12:30 P.M. sharp.
Pop Quiz: Correct or Incorrect?
1. The last outbreak of smallpox occurred in the late seventy’s.
2. Can you get here by 12:00 midnight?
3. Please deliver the package by August 1st.
Step-by-step explanation: