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