Oefen de erafsommen tot 20

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

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