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