Rekensommen met erbij en eraf tot 20
In de mix
1.
21
3
+
=
2.
20
3
+
=
3.
41
7
+
=
4.
4
1
–
=
5.
19
11
–
=
6.
37
10
+
=
7.
50
0
+
=
8.
27
12
+
=
9.
15
0
–
=
10.
24
3
+
=
11.
45
3
+
=
12.
37
24
–
=
13.
43
4
+
=
14.
20
26
+
=
15.
34
6
+
=
16.
35
5
–
=
17.
29
20
+
=
18.
37
0
+
=
19.
13
4
–
=
20.
44
3
+
=
21.
25
9
+
=
22.
28
16
–
=
23.
4
46
+
=
24.
14
14
–
=