Binary Code Worksheet

Decode, encode and add place values. Use the binary alphabet chart. Answers on page 2.

Name Date

1. Decode these words

Each group of 8 digits is one letter.

  1. 01001000 01101001 =
  2. 01000011 01100001 01110100 =
  3. 01000011 01101111 01100100 01100101 =
  4. 01000010 01111001 01110100 01100101 =

2. Write these words in binary

  1. OK =
  2. Yes =
  3. Your initials =

3. Add the place values

Add the value above every 1. Example: 00000101 = 4 + 1 = 5.

1286432168421Number
01000001
00110111
11111111

4. Crack the secret message

This code uses only 5 digits per letter: the letter’s place in the alphabet (A = 1 = 00001, B = 2 = 00010 … Z = 26 = 11010).

01000 00101 01100 01100 01111

Message =

Answer Key

Binary Code Worksheet

1. Decode these words

  1. 01001000 01101001 = Hi
  2. 01000011 01100001 01110100 = Cat
  3. 01000011 01101111 01100100 01100101 = Code
  4. 01000010 01111001 01110100 01100101 = Byte

2. Write these words in binary

  1. OK = 01001111 01001011
  2. Yes = 01011001 01100101 01110011
  3. Your initials: check each letter against the binary alphabet chart.

3. Add the place values

  1. 01000001 = 64 + 1 = 65
  2. 00110111 = 32 + 16 + 4 + 2 + 1 = 55
  3. 11111111 = 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 = 255

4. Secret message

01000 00101 01100 01100 01111 = 8, 5, 12, 12, 15 = HELLO

Check any answer, or make your own puzzles, with the free translator at binarytranslator.app