Oefen de erbijsommen tot 50

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

Oefen de erbijsommen tot 50
| ANTWOORDEN

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