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