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