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