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