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