Adding and Subtracting Y'all

12345678910111213141516171819202122
Across
  1. 3. 8-4
  2. 5. angles with a 'small opening' that measure less than 90
  3. 9. angles that are next to each other and share a vertex/side
  4. 12. 10-3
  5. 14. 10+2
  6. 15. same or equal
  7. 17. 0+1
  8. 18. 10+5
  9. 21. operation we use when combining numbers
  10. 22. 5+5
Down
  1. 1. operation we use when 'taking away'
  2. 2. lines that are always the same distance apart and will never meet
  3. 4. angles with a 'wide opening' that are greater than 90 degrees (less than 180!)
  4. 6. 9+2
  5. 7. angles across from each other when two straight angles meet (they are congruent!)
  6. 8. 3+2
  7. 10. 10+10
  8. 11. 7-4
  9. 13. 10-1
  10. 16. 9-7
  11. 19. 3+3
  12. 20. 6+2