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