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