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 values1256916A1

Convert the hexadecimal number 0x19A to decimal. Find N.

0x19AA = 10 … F = 15
N =
2.Easy
click the bits to set them012806403201608040201

Set the bits so the 8-bit register holds 0xE4. What is the pattern's value N in decimal?

0xE4
N =
3.Medium
8-bit two's complement?−128?64?32?16?8?4?2?1

Write −10 as an 8-bit two's complement pattern. Read the pattern as an unsigned binary number: what is its value U in decimal?

N = −108 bit
U =
4.Medium
8-bit two's complement0−12806403201608040201

Set the bits so they store −45 in 8-bit two's complement. Read as an unsigned number, what is the pattern's value U?

N = −458 bit
U =
5.Hard
16 bit1 px512 px512 pxM = ? KiB

An uncompressed image is 512 × 512 pixels with 16 bits per pixel. How much memory M does it take, in KiB (1 KiB = 1024 bytes)?

512 × 512 px16 bit/px1 KiB = 1024 B
M = KiB
6.Hard
2928 codes, b = ? bits?2ᵇ⁻¹…?4?2?1

A system must give every one of 2928 items its own binary code of the same length. What is the smallest number of bits b needed?

2928
b = bit

Answer key

  1. 1. N = 410
  2. 2. N = 228
  3. 3. U = 246
  4. 4. U = 211
  5. 5. M = 512 KiB
  6. 6. b = 12 bit

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