1. Calculate. 3820 - 3000 = ............     8582 - 500 =..............      4033 - 30 = ............... 3820 - 800 = ............       8582 - 2 = .............           4033 - 3 = ............... 3820 - 20 = ............         8582 - 80 = .............        4033 - 33 = ............... 2. Remember the order. 6 x 14 - 56+28 = .............               75 : 25+ 3 x 13 = ............... 98 - 4 x 18+24 = .............                 3 x 26 -78 : 13 = ............... 90 - ( 46 + 44 ) = ..............              96 : ( 2 x 12 ) = .................. 3. Find the pairs when the answer is  :