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