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