Oefen met erbij en eraf tot 100
In de mix
1.
30
20
–
=
2.
80
30
–
=
3.
50
30
+
=
4.
60
40
+
=
5.
80
50
–
=
6.
40
20
–
=
7.
20
70
+
=
8.
10
10
+
=
9.
50
20
–
=
10.
40
30
–
=
11.
20
20
+
=
12.
40
10
+
=
13.
30
20
–
=
14.
100
40
–
=
15.
20
20
+
=
16.
20
40
+
=
17.
60
20
–
=
18.
80
20
–
=
19.
80
30
–
=
20.
10
10
+
=
21.
70
30
+
=
22.
30
20
+
=
23.
40
40
+
=
24.
20
20
+
=