Rekensommen met erbij en eraf tot 100
In de mix
1.
50
10
+
=
2.
60
40
+
=
3.
40
30
–
=
4.
50
40
+
=
5.
70
40
–
=
6.
50
30
+
=
7.
20
0
+
=
8.
30
20
–
=
9.
60
20
+
=
10.
60
20
–
=
11.
70
40
–
=
12.
90
80
–
=
13.
30
10
+
=
14.
90
70
–
=
15.
20
10
+
=
16.
20
10
+
=
17.
30
30
+
=
18.
70
20
+
=
19.
80
60
–
=
20.
60
10
+
=
21.
70
40
–
=
22.
30
60
+
=
23.
50
10
+
=
24.
50
20
–
=