Addition/Subtraction

123456789
Across
  1. 3. the answer to a subtraction problem
  2. 5. adding parts of a number to find the total
  3. 7. a group of ten ones
  4. 9. to change the grouping of numbers
Down
  1. 1. to put numbers together to form a number
  2. 2. a way to make numbers easier to add or subtract by adjusting one number
  3. 4. Answer to an addition problem
  4. 6. a number added to another.
  5. 8. To break a number into parts