(a)—(iv) Because multiplication of numbers on adjacent faces are equal, i.e 6×4 = 24 and 4×4 = 16

(b)—(i) Because multiplication of numbers on adjacent faces are equal, i.e 3×3 = 9 and 8×3 = 24

(c)—(ii) Because multiplication of numbers on adjacent faces are equal, i.e 6×4 = 24 and 6×3 = 18

(d)—(iii) Because multiplication of numbers on adjacent faces are equal, i.e 3×3 = 9 and 3×9 = 27