Oefen de erafsommen tot 20
Erafsommen
|
1.
6 – 4 =
1
2
3
4
|
2.
2 – 2 =
0
4
2
1
|
3.
15 – 15 =
1
3
0
5
|
4.
5 – 5 =
4
3
5
0
|
|
5.
17 – 7 =
9
10
3
4
|
6.
18 – 7 =
12
13
15
11
|
7.
11 – 0 =
8
5
11
13
|
8.
6 – 1 =
10
4
6
5
|
|
9.
12 – 9 =
4
3
7
1
|
10.
11 – 11 =
4
1
3
0
|
11.
13 – 9 =
4
9
8
6
|
12.
19 – 1 =
21
18
4
19
|
|
13.
6 – 3 =
3
1
8
6
|
14.
8 – 1 =
12
7
5
8
|
15.
18 – 14 =
2
8
4
6
|
16.
17 – 15 =
4
2
5
3
|
|
17.
1 – 0 =
6
5
2
1
|
18.
4 – 4 =
0
1
4
2
|
19.
13 – 12 =
1
4
3
2
|
20.
9 – 3 =
11
6
5
2
|