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