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