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