Base System – 30 Practice Questions with Step-by-Step Solutions
July 1, 2024 2025-07-01 16:21Base System – 30 Practice Questions with Step-by-Step Solutions

Base System – 30 Practice Questions with Step-by-Step Solutions
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Toggle📘 Base System – 30 Practice Questions with Step-by-Step Solutions
These questions are divided into Levels of Difficulty (LOD) from 1 to 3 with increasing complexity. Click "Show/Hide Solution" to view each explanation.
1. Convert (1011)2 to base 10
- (a) 11
- (b) 13
- (c) 8
- (d) 16
- (e) None of these
\( (1011)_{2} = 1 \times 2^0 + 1 \times 2^1 + 0 \times 2^2 + 1 \times 2^3 = 11 \)
2. Convert (123)4 to base 10
- (a) 27
- (b) 29
- (c) 24
- (d) 32
- (e) None of these
\( (123)_{4} = 3 \times 4^0 + 2 \times 4^1 + 1 \times 4^2 = 27 \)
3. Convert (321)5 to base 10
- (a) 86
- (b) 88
- (c) 83
- (d) 91
- (e) None of these
\( (321)_{5} = 1 \times 5^0 + 2 \times 5^1 + 3 \times 5^2 = 86 \)
4. Convert (231)6 to base 10
- (a) 91
- (b) 93
- (c) 88
- (d) 96
- (e) None of these
\( (231)_{6} = 1 \times 6^0 + 3 \times 6^1 + 2 \times 6^2 = 91 \)
5. Convert (3210)3 to base 10
- (a) 102
- (b) 104
- (c) 99
- (d) 107
- (e) None of these
\( (3210)_{3} = 0 \times 3^0 + 1 \times 3^1 + 2 \times 3^2 + 3 \times 3^3 = 102 \)
6. Convert (321)7 to base 10
- (a) 162
- (b) 164
- (c) 159
- (d) 167
- (e) None of these
\( (321)_{7} = 1 \times 7^0 + 2 \times 7^1 + 3 \times 7^2 = 162 \)
7. Convert (123)8 to base 10
- (a) 83
- (b) 85
- (c) 80
- (d) 88
- (e) None of these
\( (123)_{8} = 3 \times 8^0 + 2 \times 8^1 + 1 \times 8^2 = 83 \)
8. Convert (201)5 to base 10
- (a) 56
- (b) 58
- (c) 53
- (d) 61
- (e) None of these
\( (201)_{5} = 1 \times 5^0 + 0 \times 5^1 + 2 \times 5^2 = 56 \)
9. Convert (1023)4 to base 10
- (a) 75
- (b) 77
- (c) 72
- (d) 80
- (e) None of these
\( (1023)_{4} = 3 \times 4^0 + 2 \times 4^1 + 0 \times 4^2 + 1 \times 4^3 = 75 \)
10. Convert (431)6 to base 10
- (a) 169
- (b) 171
- (c) 166
- (d) 174
- (e) None of these
\( (431)_{6} = 1 \times 6^0 + 3 \times 6^1 + 4 \times 6^2 = 169 \)
11. Convert 121 to base 4
- (a) 1321
- (b) 1231
- (c) 1431
- (d) 1341
- (e) None of these
Divide 121 repeatedly by 4:
121 ÷ 4 = 30 R1
30 ÷ 4 = 7 R2
7 ÷ 4 = 1 R3
1 ÷ 4 = 0 R1
\( \boxed{(1321)_{4}} \)
12. Convert 145 to base 6
- (a) 401
- (b) 411
- (c) 321
- (d) 421
- (e) None of these
Divide 145 repeatedly by 6:
145 ÷ 6 = 24 R1
24 ÷ 6 = 4 R0
4 ÷ 6 = 0 R4
\( \boxed{(401)_{6}} \)
13. Convert 85 to base 3
- (a) 10011
- (b) 11001
- (c) 11100
- (d) 10110
- (e) None of these
Divide 85 repeatedly by 3:
85 ÷ 3 = 28 R1
28 ÷ 3 = 9 R1
9 ÷ 3 = 3 R0
3 ÷ 3 = 1 R0
1 ÷ 3 = 0 R1
\( \boxed{(10011)_{3}} \)
14. Convert 100 to base 5
- (a) 400
- (b) 440
- (c) 344
- (d) 204
- (e) None of these
Divide 100 repeatedly by 5:
100 ÷ 5 = 20 R0
20 ÷ 5 = 4 R0
4 ÷ 5 = 0 R4
\( \boxed{(400)_{5}} \)
15. Convert 73 to base 8
- (a) 111
- (b) 101
- (c) 110
- (d) 121
- (e) None of these
Divide 73 repeatedly by 8:
73 ÷ 8 = 9 R1
9 ÷ 8 = 1 R1
1 ÷ 8 = 0 R1
\( \boxed{(111)_{8}} \)
16. Convert 199 to base 7
- (a) 403
- (b) 340
- (c) 430
- (d) 404
- (e) None of these
Divide 199 repeatedly by 7:
199 ÷ 7 = 28 R3
28 ÷ 7 = 4 R0
4 ÷ 7 = 0 R4
\( \boxed{(403)_{7}} \)
17. Convert 300 to base 9
- (a) 363
- (b) 336
- (c) 633
- (d) 343
- (e) None of these
Divide 300 repeatedly by 9:
300 ÷ 9 = 33 R3
33 ÷ 9 = 3 R6
3 ÷ 9 = 0 R3
\( \boxed{(363)_{9}} \)
18. Convert 154 to base 6
- (a) 414
- (b) 341
- (c) 431
- (d) 443
- (e) None of these
Divide 154 repeatedly by 6:
154 ÷ 6 = 25 R4
25 ÷ 6 = 4 R1
4 ÷ 6 = 0 R4
\( \boxed{(414)_{6}} \)
19. Convert 127 to base 2
- (a) 1111111
- (b) 1010101
- (c) 1110111
- (d) 1101111
- (e) None of these
Divide 127 repeatedly by 2:
127 ÷ 2 = 63 R1
63 ÷ 2 = 31 R1
31 ÷ 2 = 15 R1
15 ÷ 2 = 7 R1
7 ÷ 2 = 3 R1
3 ÷ 2 = 1 R1
1 ÷ 2 = 0 R1
\( \boxed{(1111111)_{2}} \)
20. Convert 99 to base 5
- (a) 344
- (b) 443
- (c) 434
- (d) 343
- (e) None of these
Divide 99 repeatedly by 5:
99 ÷ 5 = 19 R4
19 ÷ 5 = 3 R4
3 ÷ 5 = 0 R3
\( \boxed{(344)_{5}} \)
21. If (101.11)2 = (N)10, find the value of N.
- (a) 5.75
- (b) 5.95
- (c) 5.55
- (d) 6.05
- (e) None of these
\( (101.11)_{2} = 1 \times 2^4 + 0 \times 2^3 + 1 \times 2^2 + 1 \times 2^{-2} + 1 \times 2^{-3} = \boxed{5.75} \)
22. If (123.12)5 = (N)10, find the value of N.
- (a) 38.28
- (b) 38.48
- (c) 38.08
- (d) 38.58
- (e) None of these
\( (123.12)_{5} = 1 \times 5^4 + 2 \times 5^3 + 3 \times 5^2 + 1 \times 5^{-2} + 2 \times 5^{-3} = \boxed{38.28} \)
23. If (210.21)3 = (N)10, find the value of N.
- (a) 21.78
- (b) 21.98
- (c) 21.58
- (d) 22.08
- (e) None of these
\( (210.21)_{3} = 2 \times 3^4 + 1 \times 3^3 + 0 \times 3^2 + 2 \times 3^{-2} + 1 \times 3^{-3} = \boxed{21.7778} \)
24. If (321.1)4 = (N)10, find the value of N.
- (a) 57.25
- (b) 57.45
- (c) 57.05
- (d) 57.55
- (e) None of these
\( (321.1)_{4} = 3 \times 4^3 + 2 \times 4^2 + 1 \times 4^1 + 1 \times 4^{-1} = \boxed{57.25} \)
25. If (432.32)6 = (N)10, find the value of N.
- (a) 164.56
- (b) 164.76
- (c) 164.36
- (d) 164.86
- (e) None of these
\( (432.32)_{6} = 4 \times 6^4 + 3 \times 6^3 + 2 \times 6^2 + 3 \times 6^{-2} + 2 \times 6^{-3} = \boxed{164.5555} \)
26. If (301.13)5 = (N)10, find the value of N.
- (a) 81.56
- (b) 81.76
- (c) 81.36
- (d) 81.86
- (e) None of these
\( (301.13)_{5} = 3 \times 5^4 + 0 \times 5^3 + 1 \times 5^2 + 1 \times 5^{-2} + 3 \times 5^{-3} = \boxed{81.56} \)
27. If (1001.1)2 = (N)10, find the value of N.
- (a) 9.5
- (b) 9.7
- (c) 9.3
- (d) 9.8
- (e) None of these
\( (1001.1)_{2} = 1 \times 2^4 + 0 \times 2^3 + 0 \times 2^2 + 1 \times 2^1 + 1 \times 2^{-1} = \boxed{9.5} \)
28. If (124.21)7 = (N)10, find the value of N.
- (a) 67.44
- (b) 67.64
- (c) 67.24
- (d) 67.74
- (e) None of these
\( (124.21)_{7} = 1 \times 7^4 + 2 \times 7^3 + 4 \times 7^2 + 2 \times 7^{-2} + 1 \times 7^{-3} = \boxed{67.4375} \)
29. If (231.1)3 = (N)10, find the value of N.
- (a) 26.33
- (b) 26.53
- (c) 26.13
- (d) 26.63
- (e) None of these
\( (231.1)_{3} = 2 \times 3^3 + 3 \times 3^2 + 1 \times 3^1 + 1 \times 3^{-1} = \boxed{26.3333} \)
30. If (110.3)4 = (N)10, find the value of N.
- (a) 20.75
- (b) 20.95
- (c) 20.55
- (d) 21.05
- (e) None of these
\( (110.3)_{4} = 1 \times 4^3 + 1 \times 4^2 + 0 \times 4^1 + 3 \times 4^{-1} = \boxed{20.75} \)























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