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