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