Oefen met erbij en eraf tot 50
In de mix
1.
15
5
+
=
2.
30
20
–
=
3.
15
5
+
=
4.
15
15
+
=
5.
50
20
–
=
6.
15
5
+
=
7.
50
15
–
=
8.
15
10
+
=
9.
35
25
–
=
10.
15
10
+
=
11.
45
40
–
=
12.
25
20
–
=
13.
35
25
–
=
14.
25
5
+
=
15.
15
5
+
=
16.
30
5
+
=
17.
20
5
+
=
18.
50
25
–
=
19.
25
15
–
=
20.
20
15
+
=
21.
15
30
+
=
22.
40
20
–
=
23.
15
15
+
=
24.
15
5
+
=