Erbijsommen en erafsommen tot 50
In de mix
1.
35
20
–
=
2.
45
5
+
=
3.
20
10
+
=
4.
15
5
+
=
5.
30
15
–
=
6.
25
10
+
=
7.
50
20
–
=
8.
25
20
+
=
9.
15
25
+
=
10.
35
30
–
=
11.
50
15
–
=
12.
20
10
+
=
13.
20
15
–
=
14.
45
35
–
=
15.
50
35
–
=
16.
40
15
–
=
17.
15
15
+
=
18.
25
20
+
=
19.
15
5
+
=
20.
25
20
–
=
21.
20
5
+
=
22.
50
40
–
=
23.
15
10
+
=
24.
20
5
+
=