Oefen erbijsommen en erafsommen tot 20
In de mix
1.
13
9
jimmy
–
=
2.
12
8
jimmy
+
=
3.
5
13
jimmy
+
=
4.
17
10
jimmy
–
=
5.
14
11
jimmy
–
=
6.
12
3
jimmy
–
=
7.
6
5
jimmy
+
=
8.
8
2
jimmy
–
=
9.
12
2
jimmy
–
=
10.
2
4
jimmy
+
=
11.
13
11
jimmy
–
=
12.
20
8
jimmy
–
=
13.
16
1
jimmy
+
=
14.
7
4
jimmy
–
=
15.
13
9
jimmy
–
=
16.
2
14
jimmy
+
=
17.
17
6
jimmy
–
=
18.
17
2
jimmy
–
=
19.
11
2
jimmy
–
=
20.
2
0
jimmy
+
=
21.
12
3
jimmy
+
=
22.
12
10
jimmy
–
=
23.
20
8
jimmy
–
=
24.
4
8
jimmy
+
=
Oefen erbijsommen en erafsommen tot 20
| ANTWOORDEN
In de mix
1.
13
9
4
–
=
2.
12
8
20
+
=
3.
5
13
18
+
=
4.
17
10
7
–
=
5.
14
11
3
–
=
6.
12
3
9
–
=
7.
6
5
11
+
=
8.
8
2
6
–
=
9.
12
2
10
–
=
10.
2
4
6
+
=
11.
13
11
2
–
=
12.
20
8
12
–
=
13.
16
1
17
+
=
14.
7
4
3
–
=
15.
13
9
4
–
=
16.
2
14
16
+
=
17.
17
6
11
–
=
18.
17
2
15
–
=
19.
11
2
9
–
=
20.
2
0
2
+
=
21.
12
3
15
+
=
22.
12
10
2
–
=
23.
20
8
12
–
=
24.
4
8
12
+
=