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