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