18. •We measure time in hours, minutes and seconds.
•Sixty seconds make one minute.
•Sixty minutes make one hour.
•Twenty-four hours make one day.
•Seven days make one week.
•Four or five weeks make one month.
•Twelve months make one year.
19. 60 seconds 1 minute
60 minutes 1 hour
24 hours 1 day
7 days 1 week
4/5 weeks 1 month
12 months 1 year