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