Oefen de erafsommen tot 20

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

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