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