21 3 - 8 16 21 16 13 18

30 +30 30= 30 65 - 65 + 65 = 65

61 35 19 45 21 1 9 11

200 - (200 - 200)= 200 30 - ( 30+ 30) = 30

17 5 2 10 3 5 7 1

19 - (19 +19)= 19 10 +10 - 10 = 10