This document contains a series of subtraction problems without showing the solutions. There are 30 subtraction problems presented with two numbers separated by a minus sign on each line. The numbers range from 10 to 18 for the minuends and 2 to 9 for the subtrahends, exercising basic single-digit subtraction.

1. Cálculo
mental
Restas

2. 15-7=

3. 18-9=

4. 15-8=

5. 11-6=

6. 11-2=

7. 13-7=

8. 17-8=

9. 12-4=

10. 16-8=

11. 13-4=

12. 10-5=

13. 14-7=

14. 12-5=

15. 10-4=

16. 15-6=

17. 16-4=

18. 17-6=

19. 11-3=

20. 10-3=

21. 13-7=

22. 14-9=

23. 18-9=

24. 11-6=

25. 13-5=

26. 13-9=

27. 10-2=