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