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