Oefen de erbijsommen tot 50
Erbijsommen
1.
30
+
0
=
40
30
35
20
2.
0
+
30
=
40
20
30
25
3.
25
+
15
=
35
40
20
30
4.
15
+
35
=
40
35
50
30
5.
50
+
0
=
50
40
35
45
6.
10
+
40
=
50
30
40
35
7.
10
+
20
=
40
25
30
20
8.
25
+
5
=
30
35
40
25
9.
25
+
0
=
20
30
35
25
10.
15
+
10
=
20
30
25
35
11.
45
+
0
=
30
45
35
40
12.
0
+
40
=
35
40
25
30
13.
25
+
5
=
20
40
25
30
14.
35
+
5
=
35
40
20
30
15.
45
+
5
=
45
35
50
30
16.
15
+
30
=
30
40
45
35
17.
0
+
50
=
40
45
35
50
18.
0
+
45
=
30
35
40
45
19.
35
+
15
=
50
40
30
45
20.
15
+
25
=
20
25
40
35
21.
30
+
10
=
40
30
20
25
Oefen de erbijsommen tot 50
| ANTWOORDEN
Erbijsommen
1.
30
+
0
=
40
30
35
20
2.
0
+
30
=
40
20
30
25
3.
25
+
15
=
35
40
20
30
4.
15
+
35
=
40
35
50
30
5.
50
+
0
=
50
40
35
45
6.
10
+
40
=
50
30
40
35
7.
10
+
20
=
40
25
30
20
8.
25
+
5
=
30
35
40
25
9.
25
+
0
=
20
30
35
25
10.
15
+
10
=
20
30
25
35
11.
45
+
0
=
30
45
35
40
12.
0
+
40
=
35
40
25
30
13.
25
+
5
=
20
40
25
30
14.
35
+
5
=
35
40
20
30
15.
45
+
5
=
45
35
50
30
16.
15
+
30
=
30
40
45
35
17.
0
+
50
=
40
45
35
50
18.
0
+
45
=
30
35
40
45
19.
35
+
15
=
50
40
30
45
20.
15
+
25
=
20
25
40
35
21.
30
+
10
=
40
30
20
25