Add or Subtract

Date:

Fill in the missing sign ‘+’ or ‘-‘

4
9
=
13

23
7
=
30

13
8
=
5

11
4
=
7

20
40
=
60

17
5
=
12

16
9
=
7

29
4
=
33

29
5
=
24

12
13
=
25

Fill in the missing number

12
+
3
=

13
+
=
17

13
-
4
=

18
-
6
=

24
+
=
30

10
+
=
33

29
-
6
=

+
6
=
21

17
-
=
12

13
+
=
21