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