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