Number System

12345
Across
  1. 2. , the octal number system consists of how many digits
  2. 5. , in binary subtraction 1 - 1 is equal to
Down
  1. 1. , in binary addition 1 + 1 is equal to
  2. 3. , the base of binary number system is
  3. 4. , the base of decimal number system is