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