Oefen met erbij en eraf tot 50
In de mix
1.
20
15
–
=
2.
20
15
+
=
3.
15
0
+
=
4.
25
10
+
=
5.
45
40
–
=
6.
15
5
+
=
7.
30
20
–
=
8.
15
0
+
=
9.
25
20
+
=
10.
20
5
+
=
11.
40
30
–
=
12.
45
30
–
=
13.
50
40
–
=
14.
20
10
+
=
15.
40
20
–
=
16.
15
15
+
=
17.
15
5
+
=
18.
45
15
–
=
19.
30
5
+
=
20.
20
15
–
=
21.
20
15
–
=
22.
35
30
–
=
23.
15
5
+
=
24.
15
35
+
=