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