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