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