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