A sequence is defined by the rule that the value of the nth term is n multiplied by a constant. Complete the following tables:

The values of the terms are 10, 20, 30, 40. This is an arithmetic sequence where each term is the position multiplied by 10.
Pattern: Value of term = Position $\times$ 10.

Value of term for position 20 = $20 \times 10 = 200$.
The missing value is $\boxed{\text{200}}$.

The values of the terms are 3, 6, 9, 12. This is an arithmetic sequence where each term is the position multiplied by 3.
Pattern: Value of term = Position $\times$ 3.

Value of term for position 28 = $28 \times 3 = 84$.
The missing value is $\boxed{\text{84}}$.

The values of the terms are 8, 16, 24, 32. This is an arithmetic sequence where each term is the position multiplied by 8.
Pattern: Value of term = Position $\times$ 8.

Value of term for position 16 = $16 \times 8 = 128$.
The missing value is $\boxed{\text{128}}$.

The values of the terms are 12, 24, 36, 48. This is an arithmetic sequence where each term is the position multiplied by 12.
Pattern: Value of term = Position $\times$ 12.

Value of term for position 100 = $100 \times 12 = 1200$.
The missing value is $\boxed{\text{1200}}$.

The values of the terms are 15, 30, 45, 60. This is an arithmetic sequence where each term is the position multiplied by 15.
Pattern: Value of term = Position $\times$ 15.

Value of term for position 30 = $30 \times 15 = 450$.
The missing value is $\boxed{\text{450}}$.

The values of the terms are 1, 8, 27, 64. These are perfect cubes.
$1 = 1^3$
$8 = 2^3$
$27 = 3^3$
$64 = 4^3$
Pattern: Value of term = Position$^3$.

Value of term for position 50 = $50^3 = 50 \times 50 \times 50 = 125000$.
The missing value is $\boxed{\text{125000}}$.