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