Oefen met erbij en eraf tot 100
In de mix
1.
90
20
–
=
2.
40
20
–
=
3.
50
20
–
=
4.
20
20
+
=
5.
20
10
+
=
6.
30
50
+
=
7.
30
20
+
=
8.
20
40
+
=
9.
50
10
+
=
10.
30
40
+
=
11.
20
0
+
=
12.
100
40
–
=
13.
60
20
+
=
14.
60
30
+
=
15.
90
60
–
=
16.
20
50
+
=
17.
60
30
–
=
18.
20
60
+
=
19.
40
30
–
=
20.
80
50
–
=
21.
30
60
+
=
22.
30
20
+
=
23.
80
50
–
=
24.
60
40
–
=