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