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