Oefen erbijsommen en erafsommen tot 20
In de mix
1.
10
9
jimmy
+
=
2.
12
1
jimmy
+
=
3.
7
2
jimmy
+
=
4.
5
3
jimmy
–
=
5.
11
10
jimmy
–
=
6.
9
7
jimmy
–
=
7.
17
8
jimmy
–
=
8.
4
3
jimmy
–
=
9.
11
2
jimmy
–
=
10.
7
6
jimmy
–
=
11.
6
9
jimmy
+
=
12.
4
2
jimmy
+
=
13.
9
1
jimmy
+
=
14.
9
5
jimmy
–
=
15.
16
6
jimmy
–
=
16.
20
11
jimmy
–
=
17.
3
13
jimmy
+
=
18.
8
12
jimmy
+
=
19.
14
12
jimmy
–
=
20.
8
1
jimmy
+
=
21.
8
6
jimmy
+
=
22.
5
12
jimmy
+
=
23.
4
2
jimmy
–
=
24.
11
2
jimmy
–
=
Oefen erbijsommen en erafsommen tot 20
| ANTWOORDEN
In de mix
1.
10
9
19
+
=
2.
12
1
13
+
=
3.
7
2
9
+
=
4.
5
3
2
–
=
5.
11
10
1
–
=
6.
9
7
2
–
=
7.
17
8
9
–
=
8.
4
3
1
–
=
9.
11
2
9
–
=
10.
7
6
1
–
=
11.
6
9
15
+
=
12.
4
2
6
+
=
13.
9
1
10
+
=
14.
9
5
4
–
=
15.
16
6
10
–
=
16.
20
11
9
–
=
17.
3
13
16
+
=
18.
8
12
20
+
=
19.
14
12
2
–
=
20.
8
1
9
+
=
21.
8
6
14
+
=
22.
5
12
17
+
=
23.
4
2
2
–
=
24.
11
2
9
–
=