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