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