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