Oefen met erbij en eraf tot 100
In de mix
1.
20
20
+
=
2.
60
20
–
=
3.
50
30
–
=
4.
30
20
–
=
5.
60
30
+
=
6.
50
50
+
=
7.
100
20
–
=
8.
90
30
–
=
9.
40
30
+
=
10.
70
30
–
=
11.
30
20
–
=
12.
100
70
–
=
13.
90
40
–
=
14.
20
10
+
=
15.
20
10
+
=
16.
20
0
+
=
17.
50
30
–
=
18.
20
70
+
=
19.
100
60
–
=
20.
30
20
–
=
21.
40
30
+
=
22.
20
30
+
=
23.
50
30
–
=
24.
50
20
–
=