9*40 =360
380-20=360
90*4=360
1000-440=560
7*80=560
70*8=560
85+5=90
450:5=90
10*9=90
450:90=5
60-55=5
250:50=5
9*40 =360
380-20=360
90*4=360
1000-440=560
7*80=560
70*8=560
85+5=90
450:5=90
10*9=90
450:90=5
60-55=5
250:50=5