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