Number system

1234567
Across
  1. 2. has base 10
  2. 3. name derived from the number 8
  3. 6. invented the concept of 0
Down
  1. 1. contains letters as well
  2. 4. computer language
  3. 5. significant digit right most digit of a binary number
  4. 7. the number of numbers in a system