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