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