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