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