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