Oefen de erafsommen tot 20

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

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