zehnerzahl zerlege und rechne

Question

zerlege und rechne immer zuerst zur nächsten zehnerzahl
beispiel:37 + 537 [. 3 ] + [ 2 ]40 [ 2 ] = 42
45 + 845 + [.].   + [. ][ ]+ [ ]= [ ]

75 + 775 + [ ]+ [ ][ ]+ [ ]   = [ ]

84 + 984 + [ ]+ [ ][ ] + [ ]= [ ]

Answer 1

45 + 8  45 + [5].   + [2 ] =  [50 ]+ [2 ]= [52 ]

75 + 7 75 + [5 ]+ [2 ] [80 ]+ [ 2]   = [ 82]

84 + 9 84 + [6 ]+ [3 ] [90 ] + [3 ]= [ 93]