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