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