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