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