Complete number sentences involving one operation of addition or subtraction by calculating the missing number, eg find x so that 5+x=13 or 15?x=9

1. Number Detectives ? + 3 = 6
2. Number Detectives: ? + 5 = 11
3. Number Detectives: 6 + ? = 9
4. Number Detectives: ?+5 = 15
5. Number Detectives: 9 + ? = 15
6. Number Detectives: 8 + ? = 15
7. Number Detectives: ? + 10 = 32
8. Number detectives: 14 - ? = 4
9. Number detectives: 11 - ? = 5
10. Number detectives: 10 - ? = 8
11. Number detectives: 13 - ? = 5
12. Number detectives: 14 - ? = 7
13. Number detectives ? -3 = 11
14. Number detectives 17 -? = 5
15. Take 10: ? - 10 = 60
16. Subtraction chain 20 - 12 = ? - 6 = 2
17. Subtraction Chain - ?-4=21-2=19
18. Subtraction Chain - 27-4=?-6=17