Oefen de erafsommen tot 20

Erafsommen
1.
1
–
1
=
2.
1
–
0
=
3.
4
–
2
=
4.
2
–
1
=
5.
9
–
0
=
6.
2
–
1
=
7.
11
–
0
=
8.
11
–
3
=
9.
16
–
9
=
10.
7
–
0
=
11.
20
–
19
=
12.
2
–
0
=
13.
19
–
15
=
14.
15
–
10
=
15.
9
–
1
=
16.
20
–
5
=
17.
8
–
7
=
18.
8
–
7
=
19.
9
–
5
=
20.
11
–
8
=
21.
2
–
0
=
22.
17
–
1
=
23.
20
–
10
=
24.
3
–
1
=
25.
14
–
6
=
26.
14
–
10
=
27.
11
–
4
=
28.
10
–
6
=
29.
18
–
11
=
30.
8
–
4
=
31.
1
–
1
=
32.
1
–
0
=
33.
20
–
10
=
34.
1
–
1
=
35.
13
–
0
=
36.
17
–
15
=
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Oefen de erafsommen tot 20
| ANTWOORDEN

Erafsommen
1.
1
–
1
=
0
2.
1
–
0
=
1
3.
4
–
2
=
2
4.
2
–
1
=
1
5.
9
–
0
=
9
6.
2
–
1
=
1
7.
11
–
0
=
11
8.
11
–
3
=
8
9.
16
–
9
=
7
10.
7
–
0
=
7
11.
20
–
19
=
1
12.
2
–
0
=
2
13.
19
–
15
=
4
14.
15
–
10
=
5
15.
9
–
1
=
8
16.
20
–
5
=
15
17.
8
–
7
=
1
18.
8
–
7
=
1
19.
9
–
5
=
4
20.
11
–
8
=
3
21.
2
–
0
=
2
22.
17
–
1
=
16
23.
20
–
10
=
10
24.
3
–
1
=
2
25.
14
–
6
=
8
26.
14
–
10
=
4
27.
11
–
4
=
7
28.
10
–
6
=
4
29.
18
–
11
=
7
30.
8
–
4
=
4
31.
1
–
1
=
0
32.
1
–
0
=
1
33.
20
–
10
=
10
34.
1
–
1
=
0
35.
13
–
0
=
13
36.
17
–
15
=
2
© JuniorEinstein.nl
Online oefenen  |   Educatieve boeken  |   Werkbladen  |   Educatieve materialen