1. It is 11.35. The lessons started at  8.45. How long have been children at school?

........................................................................................

  The lessons end at   15.15. How much time is to the end of the schoolday?

.......................................................................................

2. Peter wants to borrow books from the library.Calculate how many books he wants to borrow. 

a) 5283 - 979 - 1478     Answer: ....................         c) 8531 - ( 2766 + 2938 )    Answer ....................        e) 5396 + 2976 - 4546     Answer: ....................         g) 3746 + 4254 - 2731    Answer: ....................

b) 6500 - ( 7052 - 3694 )    Answer ....................          d) 9000 - 3462 + 1796    Answer: ....................       f) 2479 + ( 6040 - 5694 )    Answer: ....................          h) 3867 + ( 3000 - 1498 )     Answer: ....................