2500 : 500 - 1800 : 900 = .......................................................................................

4800 : 80 - 24 = ......................................................................................................

3600 : 60 + 280 : 70 = .............................................................................................

8100 : 90 - 6400 : 80 = ...........................................................................................

500 : 50 + 27 = .......................................................................................................

30 × 50 + 8 × 60 = ...................................................................................................

60 × 40 + 150 = ......................................................................................................

80 × 600 = ..............................................................................................................

3 × 90 + 31 = ..........................................................................................................

50 × 40 + 80 × 2 + 12 × 20 = ...................................................................................

1000 - 60 × 20 = .....................................................................................................

1000 - 7 × 8 + 5 = .................................................................................................

1000 + 51 - 48 = .....................................................................................................

1000 - 6 × 5 - 4 × 7 = ..............................................................................................

1000 - 164 = ...........................................................................................................

1000 - 613 = ...........................................................................................................

1000 - 231 = ...........................................................................................................

1000 - 46 = .............................................................................................................

945 - 61 + 23 = ......................................................................................................

645 + 82 = .............................................................................................................

349 + 64 - 51 = ......................................................................................................

865 - 7 · 9 = .......................................................................................................

1000 - 75 = .......................................................................................................

946 - 6 · 5 = .........................................................................................................

8 · 6 + 95 = ..........................................................................................................