Oefen de erafsommen tot 20

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

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