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