Oefen de erafsommen tot 20
Erafsommen
|
1.
17 – 2 =
18
19
15
16
|
2.
17 – 12 =
3
2
5
7
|
3.
4 – 0 =
3
5
4
9
|
4.
5 – 5 =
5
0
1
3
|
|
5.
14 – 13 =
3
2
4
1
|
6.
14 – 7 =
1
9
7
2
|
7.
18 – 12 =
10
4
6
5
|
8.
11 – 4 =
7
11
9
5
|
|
9.
11 – 7 =
6
7
2
4
|
10.
9 – 1 =
6
2
4
8
|
11.
7 – 5 =
4
3
2
1
|
12.
9 – 4 =
1
5
3
7
|
|
13.
4 – 2 =
3
2
6
1
|
14.
3 – 1 =
6
7
4
2
|
15.
6 – 6 =
0
3
1
5
|
16.
9 – 0 =
7
12
9
2
|
|
17.
8 – 4 =
2
9
4
7
|
18.
8 – 5 =
1
7
3
6
|
19.
2 – 0 =
2
3
1
5
|
20.
6 – 3 =
7
3
6
1
|