11 – 3 = 11 – 5 = 11 – 9 = 11 – 10 =
11 – 6 = 5 +6 = 4 +8 = 7 +9 =
11 – 4 = 11 – 2 = 7 +5 = 3 + 9 =
11–= 7 11–=4 +2=11
–9 = 2 –8 = 2 7+=11
3+=11 11–=6 –11 =0