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