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