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