Răspuns:
a) 12 = 2 x 2 x 3 = 2² x 3
b) 18 = 2 x 3 x 3 = 2 x 3²
c) 20 = 2 x 2 x 5 = 2² x 5
d) 24 = 2 x 2 x 2 x 3 = 2³ x 3
e) 28 = 2 x 2 x 7 = 2² x 7
f) 32 = 2 x 2 x 2 x 2 x 2 = 2⁵
g) 36 = 2 x 2 x 3 x 3 = 2² x 3²
h) 40 = 2 x 2 x 2 x 5 = 2³ x 5
i) 45 = 3 x 3 x 5 = 3² x 5
j) 48 = 2 x 2 x 2 x 2 x 3 = 2⁴ x 3