Zamieniamy liczbę z systemu silniowego na system dziesiętny:

(310)_! = 3·3! + 1·2! + 0·1! = 3 · 6 + 2 + 0 = 20

(2011)_! = 2 ⋅ 4! + 0 ⋅ 3! + 1 ⋅ 2! + 1 ⋅ 1! = 2 ⋅ 24 + 0 + 2 + 1 = 51

(54211)_! = 5 ⋅ 5! + 4 ⋅ 4! + 2 ⋅ 3! + 1 ⋅ 2! + 1 ⋅ 1! = 5 ⋅ 120 + 4 ⋅ 24 + 2 ⋅ 6 + 2 + 1 = 711