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