Snelle erbijsommen en erafsommen tot 50
In de mix
1.
30
10
+
=
2.
30
25
–
=
3.
50
20
–
=
4.
10
5
+
=
5.
25
10
+
=
6.
40
20
–
=
7.
20
10
+
=
8.
20
20
+
=
9.
25
15
–
=
10.
15
5
+
=
11.
20
15
–
=
12.
40
15
–
=
13.
15
5
+
=
14.
30
20
+
=
15.
20
15
–
=
16.
35
30
–
=
17.
20
5
+
=
18.
20
15
–
=
19.
15
0
+
=
20.
45
30
–
=
21.
15
5
+
=
22.
30
20
–
=
23.
45
30
–
=
24.
30
20
+
=