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