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