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