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