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