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