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