Numbers

123456789101112131415
Across
  1. 2. five + five
  2. 4. ten + three
  3. 7. fourteen + three
  4. 9. thirteen + four
  5. 12. eighteen + two
  6. 13. six + six
  7. 14. twenty - six
  8. 15. four-four
Down
  1. 1. nine + one
  2. 3. fifteen - four
  3. 5. four+ one
  4. 6. four+ two
  5. 8. fourteen + four
  6. 10. five+ four
  7. 11. thirteen + two
  8. 12. seven - four
  9. 14. three + one