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 valuesF25691601

Convert the hexadecimal number 0xF90 to decimal. Find N.

0xF90A = 10 … F = 15
N =
2.Easy
click the bits to set them012806403201608040201

Set the bits so the 8-bit register holds 0xF7. What is the pattern's value N in decimal?

0xF7
N =
3.Medium
8-bit two's complement?−128?64?32?16?8?4?2?1

Write −3 as an 8-bit two's complement pattern. Read the pattern as an unsigned binary number: what is its value U in decimal?

N = −38 bit
U =
4.Medium
8-bit two's complement0−12806403201608040201

Set the bits so they store −10 in 8-bit two's complement. Read as an unsigned number, what is the pattern's value U?

N = −108 bit
U =
5.Hard
1870 codes, b = ? bits?2ᵇ⁻¹…?4?2?1

A system must give every one of 1870 items its own binary code of the same length. What is the smallest number of bits b needed?

1870
b = bit
6.Hard
4894 codes, b = ? bits?2ᵇ⁻¹…?4?2?1

A system must give every one of 4894 items its own binary code of the same length. What is the smallest number of bits b needed?

4894
b = bit

Answer key

  1. 1. N = 3984
  2. 2. N = 247
  3. 3. U = 253
  4. 4. U = 246
  5. 5. b = 11 bit
  6. 6. b = 13 bit

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