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