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