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