ARITHMETIC 



291 



MEASURES OF TIME 



60 seconds (sec.) = 1 minute min. 



60 minutes =1 hour hr. 



24 hours =1 day da. 



7 days =1 week wk. 



4 weeks =1 month mo. 



12 months =1 year yr. 



100 years =1 century 



sec. min. hr. da wk. yr. 



60= 1 



3,600= 60= 1 

 86,400= 1,440= 24= 1 

 604,800= 10,080= 168= 7 = 



C. 



31,556,936 = 525,948 = 8,765 = 365 = 



1 

 52 = 



The following is a list of the months, in regular order, 

 with the number of days each contains: 



Days 



1. January (Jan.) 31 



2. February (Feb) 28 



3. March (Mar.) 31 



4. April (Apr.) 30 



5. May 31 



6. June 30 



Days 



7. July 31 



8. August (Aug.) 31 



9. September (Sept.).. 30 



10. October (Oct.) 31 



11. November (Nov.) ..30 



12. December (Dec.) ...31 



In leap years, 1 da. is added to Feb., giving it 

 29 da. The following lines will assist in remembering 

 the number of days in each month: 



"Thirty days have September, 

 April, June, and November; 

 All the rest have thirty-one, 

 Except the second month alone, 

 To which we twenty-eight assign, 

 'Till leap year gives it twenty-nine." 

 In many business transactions, the year is regarded as 

 360 da., or 12 mo. of 30 da. each. 



