1.  There are 21 cakes. Each cake is cut into 9 parts. Each part is further cut into 3 pieces. How many cake pieces are there in all? 
  

2.  The Professors at the State University drank 124 cups of tea yesterday. They drank 68 cups in the morning and 30 in the afternoon. How many did they drink in the evening? 
  

3.  Warren has a collection of 173 books. He donated 18 books last year and 30 books this year. How many books does he still have? 
  

4.  A school has 5 dining halls. Each dining hall has21 tables. If there are four children to each table, how many children stay for lunch? 
  

5.  Last month, Jack worked for 189 hours, Greg worked for 140 hours, and Edward worked 25 hours more than Jack. How many hours did they work altogether? 
  
