Oefen met erbij en eraf tot 100
In de mix
1.
20
80
+
=
2.
30
20
+
=
3.
100
90
–
=
4.
50
10
+
=
5.
80
40
–
=
6.
60
40
–
=
7.
30
10
+
=
8.
50
10
+
=
9.
30
20
–
=
10.
30
10
+
=
11.
50
30
+
=
12.
30
20
–
=
13.
30
20
–
=
14.
50
20
–
=
15.
50
40
–
=
16.
80
20
+
=
17.
50
40
–
=
18.
10
10
+
=
19.
90
80
–
=
20.
40
20
–
=
21.
70
10
+
=
22.
80
70
–
=
23.
90
30
–
=
24.
20
0
+
=