Number systems worksheet with answers

Free printable Number systems worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy
place values5256016D1

Convert the hexadecimal number 0x50D to decimal. Find N.

0x50DA = 10 … F = 15
N =
2.Easy
place values1256D16F1

Convert the hexadecimal number 0x1DF to decimal. Find N.

0x1DFA = 10 … F = 15
N =
3.Medium
8-bit two's complement0−12806403201608040201

Set the bits so they store −96 in 8-bit two's complement. Read as an unsigned number, what is the pattern's value U?

N = −968 bit
U =
4.Medium
8-bit two's complement?−128?64?32?16?8?4?2?1

Write −22 as an 8-bit two's complement pattern. Read the pattern as an unsigned binary number: what is its value U in decimal?

N = −228 bit
U =
5.Hard
2224 codes, b = ? bits?2ᵇ⁻¹…?4?2?1

A system must give every one of 2224 items its own binary code of the same length. What is the smallest number of bits b needed?

2224
b = bit
6.Hard
322 codes, b = ? bits?2ᵇ⁻¹…?4?2?1

A system must give every one of 322 items its own binary code of the same length. What is the smallest number of bits b needed?

322
b = bit

Answer key

  1. 1. N = 1293
  2. 2. N = 479
  3. 3. U = 160
  4. 4. U = 234
  5. 5. b = 12 bit
  6. 6. b = 9 bit

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