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