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