Math Crossword Puzzle

123456
Across
  1. 4. A reasonable guess of the actual value of a number.
  2. 5. The operation in which dividing one number into another.
  3. 6. When you find the sum of two numbers?
Down
  1. 1. Its made up a numerator and denominator.
  2. 2. When you find the differences between two numbers?
  3. 3. The repeated additions of two numbers.