Hexa decimal number

Hexa decimal number is system number who have 16 digit numbers, which is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F, where:
A present of 10
B present of 11
C present of 12
D present of 13
E present of 14
F present of 15.
Hexa decimal number base 16 numeral system.

Hexa decimal number weights
16⁰ = 1 → first digit, weights one
16¹ = 16 → second digit, weights sixteen
16² = 256 → third digit, weights two hundred and six
16³ = 4096 → fourth digit, weights 512
16⁴ = 65536 → fifth digit, weights 4096
etc.

Example 1:
Convert Hexa decimal number 750 to decimal number

Completion:
750 ₍₁₆₎ = ? ₍₁₀₎
0 → 0 × 16⁰ = 0
5 → 5 × 16¹ = 80
7 → 7 × 16² = 7 × 256 = 1792
750 → 0 + 80 + 1792 = 1872
750 ₍₁₆₎ = 1872 ₍₁₀₎.

Example 2:
Convert Hexa decimal number 20BCA to decimal number

Completion:
20BCA ₍₁₆₎ = ? ₍₁₀₎
A → 10 × 16⁰ = 10
C → 12 × 16¹ = 192
B → 11 × 16² = 11 × 256 = 2816
0 → 0 × 16³ = 0
2 → 2 × 16⁴ = 2 × 65536 = 131072
20BCA → 10 + 192 + 2816 + 0 + 131072 = 134090
20BCA ₍₁₆₎ = 134090 ₍₁₀₎.

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Octal number

Octal number is system number who have 8 digit numbers, which is 0, 1, 2, 3, 4, 5, 6 and 7. Octal number base 8 numeral system.

Octal number weights
8⁰ = 1 → first digit, weights one
8¹ = 8 → second digit, weights eight
8² = 64 → third digit, weights sixty four
8³ = 512 → fourth digit, weights 512
8⁴ = 4096 → fifth digit, weights 4096
etc.

Example 1:
Convert Octal number 370 to decimal number

Completion:
370 ₍₈₎ = ? ₍₁₀₎
0 → 0 × 8⁰ = 0
7 → 7 × 8¹ = 56
3 → 3 × 8² = 192
370 → 0 + 56 + 192 = 248
370 ₍₈₎ = 248 ₍₁₀₎

Example 2:
Convert Octal number 55017 to decimal number

Completion:
55017 ₍₈₎ = ? ₍₁₀₎
7 → 7 × 8⁰ = 7
1 → 1 × 8¹ = 8
0 → 0 × 8² = 0
5 → 5 × 8³ = 2560
5 → 5 × 8⁴ = 20480
55017 → 7 + 8 + 0 + 2560 + 20480 = 23055
55017 ₍₈₎ = 23055 ₍₁₀₎

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