Oefen met erbij en eraf tot 50
In de mix
1.
35
10
+
=
2.
35
15
+
=
3.
30
25
–
=
4.
30
20
–
=
5.
20
15
–
=
6.
35
30
–
=
7.
25
20
–
=
8.
40
30
–
=
9.
50
30
–
=
10.
25
15
–
=
11.
50
20
–
=
12.
45
25
–
=
13.
15
5
+
=
14.
45
40
–
=
15.
25
15
–
=
16.
35
5
+
=
17.
20
5
+
=
18.
15
0
+
=
19.
30
15
+
=
20.
30
15
–
=
21.
45
40
–
=
22.
20
15
–
=
23.
30
15
–
=
24.
50
35
–
=