Oefen met erbij en eraf tot 100
In de mix
1.
50
20
+
=
2.
20
30
+
=
3.
60
30
–
=
4.
30
40
+
=
5.
40
60
+
=
6.
30
30
+
=
7.
100
90
–
=
8.
40
10
+
=
9.
80
20
–
=
10.
20
40
+
=
11.
90
40
–
=
12.
40
20
+
=
13.
70
30
–
=
14.
50
10
+
=
15.
60
40
–
=
16.
20
10
+
=
17.
70
20
+
=
18.
90
10
+
=
19.
50
30
+
=
20.
30
10
+
=
21.
70
60
–
=
22.
50
30
–
=
23.
30
20
–
=
24.
50
20
–
=