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