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