一、直接计算

1. $25 + 37 =$
2. $48 + 16 =$
3. $63 + 29 =$
4. $51 + 42 =$
5. $19 + 75 =$
6. $38 + 54 =$
7. $70 + 23 =$
8. $46 + 8 =$
9. $17 + 6 =$
10. $59 + 2 =$
11. $80 - 26 =$
12. $53 - 18 =$
13. $91 - 47 =$
14. $64 - 35 =$
15. $75 - 9 =$
16. $42 - 17 =$
17. $30 - 14 =$
18. $96 - 50 =$
19. $50 - 2 =$
20. $23 - 7 =$
21. $7 \times 6 =$
22. $9 \times 3 =$
23. $5 \times 8 =$
24. $4 \times 9 =$
25. $8 \times 7 =$
26. $6 \times 5 =$
27. $3 \times 7 =$
28. $9 \times 8 =$
29. $2 \times 9 =$
30. $1 \times 5 =$
31. $56 \div 7 =$
32. $42 \div 6 =$
33. $63 \div 9 =$
34. $36 \div 4 =$
35. $28 \div 5 =$
36. $40 \div 7 =$
37. $50 \div 8 =$
38. $17 \div 2 =$
39. $34 \div 6 =$
40. $65 \div 9 =$

二、混合运算

1. $15 + 4 \times 7 =$
2. $8 \times 6 - 20 =$
3. $54 \div 9 + 18 =$
4. $30 - 24 \div 3 =$
5. $2 \times 9 + 15 =$
6. $7 \times 8 - 35 =$
7. $45 \div 5 + 23 =$
8. $70 - 6 \times 9 =$
9. $10 + 35 \div 7 =$
10. $64 \div 8 - 5 =$
11. $(20 + 16) \div 6 =$
12. $9 \times (35 - 28) =$
13. $(72 - 18) \div 9 =$
14. $5 \times (42 \div 6) =$
15. $(12 + 28) \div 5 =$
16. $8 \times (18 \div 3) =$
17. $(9 \times 7) - 25 =$
18. $48 \div (12 - 6) =$
19. $7 \times (10 - 3) =$
20. $(36 \div 4) + 11 =$