1. Subtraction by mental calculation of double digit and single digit numbers without regrouping
2. Subtraction by mental calculation of double digit number - 10
3. Subtraction by mental calculation of double digit and single digit numbers with regrouping in the ones' place (1)
4. Subtraction by mental calculation of double digit and single digit numbers with regrouping in the ones' place (2)
5. Subtraction by mental calculation of double digit and single digit numbers with regrouping in the ones' place (3)
6. Subtraction by mental calculation of double digit and single digit numbers with regrouping in the ones' place (4)
7. Subtraction by paper and pencil calculation of double digit and single digit numbers with regrouping in the ones' place
8. Subtraction by mental calculation of double digit and double digit numbers without regrouping
9. Subtraction by mental calculation of double digit several tens
10. Subtraction by mental calculation of double digit and double digit numbers with regrouping in the ones' place (1)
11. Subtraction by mental calculation of double digit and double digit numbers with regrouping in the ones' place (2)
12. Subtraction by mental calculation of double digit and double digit numbers with regrouping in the ones' place (3)
13. Subtraction by mental calculation of double digit and single digit numbers with regrouping of tne in the ones' place
14. Subtraction by paper and pencil calculation of double digit and double digit numbers with regrouping in the ones' place
15. Subtraction of three numbers by mental calculation (1)
16. Subtraction of three numbers by mental calculation (2)
17. Addition and Subtraction of three numbers by mental calculation
18. Subtraction and addition of three numbers by mental calculation
19. Subtraction in various methods by mental calculation

Achievement test
Answer sheet