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