Convert an integer decimal number to the specified number system. Make a check, i.e. convert the result back

Convert an integer decimal number to the specified number system. Make a check, i.e. convert the result back to the decimal number system: a. 37₁₀ – X₂; B. 94₁₀ -X₂; with. 68₁₀ -X₈;

37₁₀ – X₂
37: 2 = 18 (remainder 1)
18: 2 = 9 (remainder 0)
9: 2 = 4 (remainder 1)
4: 2 = 2 (remainder 0)
2: 2 = 1 (remainder 0)
Answer: 100101
Examination:
543210
100101
1 * 25 + 0 * 24 + 0 * 23 + 1 * 22 + 0 * 21 + 1 * 20 = 32 + 4 +1 = 37

94₁₀ – X₂
94: 2 = 47 (remainder 0)
47: 2 = 23 (remainder 1)
23: 2 = 11 (remainder 1)
11: 2 = 5 (remainder 1)
5: 2 = 2 (remainder 1)
2: 2 = 1 (remainder 0)
Answer: 1011110
Examination:
6543210
1011110
1 * 26 + 0 * 25 + 1 * 24 + 1 * 23 + 1 * 22 + 1 * 21 + 0 * 20 = 64 + 16 + 8 +4 +2 = 94

68₁₀ -X₈
68: 8 = 8 (remainder 4)
8: 8 = 1 (remainder 0)
Answer: 104
Examination:
210
104
1 * 82 + 0 * 81 + 4 * 80 = 64 + 4 = 68