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