Oefen de erafsommen tot 20

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

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