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