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
click the bits to set them012806403201608040201

Set the bits so the 8-bit register holds 0x5C. What is the pattern's value N in decimal?

0x5C
N =
2.Easy
click the bits to set them012806403201608040201

Set the bits so the 8-bit register holds 0x6F. What is the pattern's value N in decimal?

0x6F
N =
3.Medium
8-bit two's complement?−128?64?32?16?8?4?2?1

Write −74 as an 8-bit two's complement pattern. Read the pattern as an unsigned binary number: what is its value U in decimal?

N = −748 bit
U =
4.Medium
8-bit two's complement0−12806403201608040201

Set the bits so they store −104 in 8-bit two's complement. Read as an unsigned number, what is the pattern's value U?

N = −1048 bit
U =
5.Hard
2677 codes, b = ? bits?2ᵇ⁻¹…?4?2?1

A system must give every one of 2677 items its own binary code of the same length. What is the smallest number of bits b needed?

2677
b = bit
6.Hard
430 codes, b = ? bits?2ᵇ⁻¹…?4?2?1

A system must give every one of 430 items its own binary code of the same length. What is the smallest number of bits b needed?

430
b = bit

Answer key

  1. 1. N = 92
  2. 2. N = 111
  3. 3. U = 182
  4. 4. U = 152
  5. 5. b = 12 bit
  6. 6. b = 9 bit

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