WALT: read and write numbers to 20

1234567891011121314151617181920
Across
  1. 5. 10-7
  2. 8. 25-10
  3. 11. 10+3
  4. 14. 10 divided by 2
  5. 15. 10+5+4
  6. 17. 10-1
  7. 18. 3+5
  8. 20. 40 divided by 2
Down
  1. 1. 10+6
  2. 2. 2x2
  3. 3. 5+2
  4. 4. 12-1
  5. 6. 20-3
  6. 7. 28-10
  7. 9. 20-6
  8. 10. 2x5
  9. 12. 10-9
  10. 13. 2x3
  11. 16. 6+6
  12. 19. 10-8