11
$□ ◯ □ =□$
$□ ◯ □ =□$
$□ ◯ □ =□$(个)

答案略

算一算
$35 - 5 =$
$48 - 40 =$
$50 + 5 =$
$63 - 60 =$
$33 - 3 =$
$5 + 30 =$
$54 - 50 =$
$24 - 4 =$
$82 - 80 =$
$67 - 7 =$
$4 + 30 =$
$37 - 30 =$
$99 - 9 =$
$9 + 20 =$
$75 - 70 =$
$20 + 7 =$
$7 + 60 =$

1. $35 - 5 = 30$
2. $48 - 40 = 8$
3. $50 + 5 = 55$
4. $63 - 60 = 3$
5. $33 - 3 = 30$
6. $5 + 30 = 35$
7. $54 - 50 = 4$
8. $24 - 4 = 20$
9. $82 - 80 = 2$
10. $67 - 7 = 60$
11. $4 + 30 = 34$
12. $37 - 30 = 7$
13. $99 - 9 = 90$
14. $9 + 20 = 29$
15. $75 - 70 = 5$
16. $20 + 7 = 27$
17. $7 + 60 = 67$