Rekensommen met eraf tot 20

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

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