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