1.
a |-----|+7|
b |-----| } 27.
27 - 7 = 20 ( 2 segmente egale)
20 : 2 = 10 (b)
10 + 7 = 17 (a)
Verificare : 10 +17 = 27.
27 - 20 = 7.
2.
a |-----|+28|
b |-----| } 44.
44 - 28 = 16 ( 2 segmente egale)
16 : 2 = 8 (b)
8 + 28 = 36 (a)
Verificare : 36 + 8 = 44
36 - 8 = 28