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