Drew's puzzle

12345678
Across
  1. 1. operation of summing
  2. 2. the number obtained by division
  3. 3. mathematical relationship or rule expressed in symbols
  4. 4. the whole amount
  5. 5. denotes square root or nth roots
  6. 7. group of symbols that make a mathematical statement
Down
  1. 1. a quantity obtained by multiplication
  2. 3. quotient of two rational numbers
  3. 6. a length between two points
  4. 8. branch of mathematics that describes relationships