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