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