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