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