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